A small tool to view real-world ActivityPub objects as JSON! Enter a URL
or username from Mastodon or a similar service below, and we'll send a
request with
the right
Accept
header
to the server to view the underlying object.
{
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"id": "https://mathstodon.xyz/users/davidradcliffe/outbox?page=true",
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"id": "https://mathstodon.xyz/users/davidradcliffe/statuses/113415767473921719/activity",
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"published": "2024-11-02T22:41:12Z",
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"content": "<p>Here's a screenshot, in case the equation doesn't render for you.</p>",
"contentMap": {
"en": "<p>Here's a screenshot, in case the equation doesn't render for you.</p>"
},
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{
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"url": "https://media.mathstodon.xyz/media_attachments/files/113/415/761/226/259/934/original/a111527cb66f46d8.png",
"name": "The sum of the inverse hyperbolic tangent of 1 over n cubed from n equals 2 to infinity is equal to the inverse hyperbolic tangent of one fifth.",
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"id": "https://mathstodon.xyz/users/davidradcliffe/statuses/113415755450332934/activity",
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"published": "2024-11-02T22:38:08Z",
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"content": "<p>Does the following equation have a nice geometric interpretation?</p><p>\\[\\sum_{n=2}^{\\infty} \\tanh^{-1} \\frac{1}{n^3} = \\tanh^{-1} \\frac{1}{5}\\]</p>",
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"en": "<p>Does the following equation have a nice geometric interpretation?</p><p>\\[\\sum_{n=2}^{\\infty} \\tanh^{-1} \\frac{1}{n^3} = \\tanh^{-1} \\frac{1}{5}\\]</p>"
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"content": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@drScott\" class=\"u-url mention\">@<span>drScott</span></a></span> It's because n! can be factored as 1*2*...*n.</p>",
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"en": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@drScott\" class=\"u-url mention\">@<span>drScott</span></a></span> It's because n! can be factored as 1*2*...*n.</p>"
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"conversation": "tag:mathstodon.xyz,2024-10-14:objectId=118856731:objectType=Conversation",
"content": "<p>If N is the product of two primes, p < q, then 𝑝=gcd(𝑁,⌊√𝑁⌋!) . This is not a practical factorization method, because we don't know an efficient algorithm to compute factorials mod N. But it makes me wonder if a similar sequence of highly composite numbers could be used as the basis of an efficient algorithm for integer factorization.</p>",
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"en": "<p>If N is the product of two primes, p < q, then 𝑝=gcd(𝑁,⌊√𝑁⌋!) . This is not a practical factorization method, because we don't know an efficient algorithm to compute factorials mod N. But it makes me wonder if a similar sequence of highly composite numbers could be used as the basis of an efficient algorithm for integer factorization.</p>"
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"id": "https://mathstodon.xyz/users/davidradcliffe/statuses/113233001113420139/activity",
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"content": "<p>1, 3, and 11677 are the only odd numbers less than 10^11 whose squares can be written in base 8 using only the digits 0 and 1. </p><p>1² = 1₈ <br />3² = 11₈ <br />11677² = 1010111111₈ </p><p>Are there any other (odd) numbers with this property?</p>",
"contentMap": {
"en": "<p>1, 3, and 11677 are the only odd numbers less than 10^11 whose squares can be written in base 8 using only the digits 0 and 1. </p><p>1² = 1₈ <br />3² = 11₈ <br />11677² = 1010111111₈ </p><p>Are there any other (odd) numbers with this property?</p>"
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"published": "2024-09-28T01:03:43Z",
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"published": "2024-09-24T17:02:20Z",
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"conversation": "tag:mathstodon.xyz,2024-09-24:objectId=115834211:objectType=Conversation",
"content": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@christianp\" class=\"u-url mention\">@<span>christianp</span></a></span> This makes me wonder about other kinds of analog clocks. Has anyone ever made a clock whose minute and hour hands move in opposite directions?</p>",
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"en": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://mathstodon.xyz/@christianp\" class=\"u-url mention\">@<span>christianp</span></a></span> This makes me wonder about other kinds of analog clocks. Has anyone ever made a clock whose minute and hour hands move in opposite directions?</p>"
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"content": "<p>I ate your plums<br />No time to explain</p>",
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"content": "<p>Find a sequence of 1000 positive integers in arithmetic progression whose digit sums in base 10 are equal.</p>",
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"content": "<p><span class=\"h-card\" translate=\"no\"><a href=\"https://social.sciences.re/@minimaliste13\" class=\"u-url mention\">@<span>minimaliste13</span></a></span> The expected number of terms is e = 2.71828...</p>",
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"content": "<p>Is there an algorithm for computing the sum of the decimal digits of 2^n that is more efficient than computing the complete decimal expansion of 2^n?</p>",
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"content": "<p>I have a question about Sudokus with "negative clues." A negative clue is a statement that a particular cell does NOT contain a particular value, e.g. "the value in row 3 and column 5 is not 7." What is the minimum number of negative clues that can uniquely determine a completed Sudoku grid?</p><p>I posted the question here: <a href=\"https://puzzling.stackexchange.com/questions/128396/minimum-number-of-negative-clues-for-a-9-x-9-sudoku\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" translate=\"no\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">puzzling.stackexchange.com/que</span><span class=\"invisible\">stions/128396/minimum-number-of-negative-clues-for-a-9-x-9-sudoku</span></a></p>",
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