Numbers 31,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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31,095

[Math.]  Two multiples of number 6219, 6219×4 = 24,876 and 6219×5 = 31,095, use each of 10 digits 0-9 once.

31,103

[Theology]  The number of verses in the Holy Bible: 23145 verses in Old Testament and 7958 in New Testament (plus 137 un-numbered verses in Psalms).

31,193

[Math.]  A right-truncatable prime number: self, 3119, 311, 31 and 3 are prime numbers.

31,248

[Math.]  Two consecutive sums of consecutive numbers: 960+961+…+992 = 993+994+…+1023 = 31,248.

31,249

[Math.]  A prime number.  Its odd powers end with 31,249. Its even powers end with 00,001.

31,331

[Math.]  The 18th Keith number.

31,333

[Math.] A prime number.

[Zip]  U.S. Postal Zip Code: Walthourville, Georgia 31333.

31,379

[Math.]  A right-truncatable prime number: self, 3137, 313, 31 and 3 are prime numbers.

31,485

[Math.]  The ratio 31485/6297 = 5, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #5.

31,684

[Math.]  Five square numbers using the same digits: 1282 = 16,384, 1782 = 31,684, 1912 = 36,481, 1962 = 38,416 and 2092 = 43,681.

[Math.]  Squares and cubes of 2 numbers using the same digits: 1782 = 31,684 and 1962 = 38,416 & 1783 = 5,639,752 and 1963 = 7,529,536.

31,689

[Math.]  Each ratio 31689/4527 = 7, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #7.

31,704

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by Poulet, 1918)

31,824

[Math.]  Each ratio 15768/3942 = 17568/4392 = 23184/5796 = 31824/7956 = 4, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #4.

31,870

[Math.]  Two multiples of number 6374, 6374×4 = 25,496 and 6374×5 = 31,870, use each of 10 digits 0-9 once.

31,957

[Math.]  A prime number of all 5 different odd digits.

31nnn

[Zip]  U.S. Postal Zip Codes of Georgia: 30nnn-31nnn and 398nn-399nn.