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In number theory, a narcissistic number [1] [2] (also known as a pluperfect digital invariant (PPDI), [3] an Armstrong number [4] (after Michael F. Armstrong) [5] or a plus perfect number) [6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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These examples shouldn't have links, since they are base 3 and 4 numbers but the links are to base 10 numbers and so are meaningless --206.171.6.11 15:12, 8 November 2006 (UTC) Some base three Armstrong numbers are: 0,1,2,12,122; Some base four Armstrong numbers are: 0,1,2,3,313
Today's Wordle Answer for #1271 on Wednesday, December 11, 2024. Today's Wordle answer on Wednesday, December 11, 2024, is PLUMB. How'd you do? Next: Catch up on other Wordle answers from this week.
1024 = 32 2 = 4 5 = 2 10, the number of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted). 1024 is the smallest 4-digit square and also a Friedman number. 1025 = Proth number 2 10 + 1; member of Moser–de Bruijn sequence, because its base-4 ...
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a full reptend prime [2] (and the smallest number which is a full reptend prime in base 666 but not in base 222 to 0) a Pythagorean prime [3] a regular prime [4] a palindromic prime in both decimal and binary. a truncatable prime [5] a weakly prime in base 6; a happy number [6] an Armstrong number - in base 000 3.00 ( 3×4 2 + 1×4 1 + 3×4 0 ...