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15 May 2020 00:00![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
iad58- 53 appears to be the smallest number of squares on a standard chessboard attacked by eight queens.
- 100053 − 53 is prime. Note that 53 is the smallest number with this property.
- The sum of the first 53 primes is 5830, which is divisible by 53, a property shared by few other numbers.
- 53 in decimal is 35 in hexadecimal. Four additional multiples of 53 share this property: 371 = 173₁₆, 5141 = 1415₁₆, 99481 = 18499₁₆, and 8520280 = 082025816. Apart from the trivial case of single-digit decimals, no other number has this property.
- The reversal of 53 (that is, 35) equals the sum of digits of 53³.
- The month and day are simultaneously prime a total of 53 times in a leap year.
- The chance that no pair of 53 people in a room have the same birthday is approximately 1/53.
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Date: 14 May 2020 21:25 (UTC)с днём рождения, Медведь, будь здоров и благополучен!
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Date: 16 May 2020 13:52 (UTC)Спасибо, К.-Д.-Винни-Пух, буду стараться!
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Date: 14 May 2020 21:40 (UTC)no subject
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Date: 15 May 2020 07:51 (UTC)no subject
Date: 16 May 2020 13:57 (UTC)А они, похоже, бывают каждые шесть лет. Во всяком случае, столько назад у меня было и через столько же опять будет.
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Date: 15 May 2020 08:34 (UTC)no subject
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Date: 15 May 2020 19:34 (UTC)no subject
Date: 16 May 2020 14:00 (UTC)no subject
Date: 16 May 2020 14:09 (UTC)С днем рождения!
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Date: 16 May 2020 14:27 (UTC)no subject
Date: 16 May 2020 18:07 (UTC)no subject
Date: 16 May 2020 19:07 (UTC)