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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 Nivenmorphic number or harshadmorphic number for a given number base is an integer t such that there exists some harshad number N whose digit sum is t, and t, written in that base, terminates N written in the same base. For example, 18 is a Nivenmorphic number for base 10: 16218 is a harshad number 16218 has 18 as digit sum 18 terminates 16218
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OCaml, C#, Haskell: 2005 Haxe: Nicolas Cannasse ActionScript, OCaml, Java: 2005 Oxygene: RemObjects Software: Object Pascal, C#: 2005 PWCT: Mahmoud Samir Fayed: none (unique language) 2005 Seed7: Thomas Mertes none (unique language) 2005 fish: Thomas Mertes none (unique language) 2006 Cobra: Chuck Esterbrook Python, C#, Eiffel, Objective-C 2006 ...
Armstrong's axioms are a set of axioms (or, more precisely, inference rules) used to infer all the functional dependencies on a relational database. They were developed by William W. Armstrong in his 1974 paper. [ 1 ]
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Such a failure in random number generation caused users of Android Bitcoin Wallet to lose their funds in August 2013. [ 4 ] To ensure that k {\displaystyle k} is unique for each message, one may bypass random number generation completely and generate deterministic signatures by deriving k {\displaystyle k} from both the message and the private key.
Given a number base , a natural number with digits is an automorphic number if is a fixed point of the polynomial function = over /, the ring of integers modulo.As the inverse limit of / is , the ring of -adic integers, automorphic numbers are used to find the numerical representations of the fixed points of () = over .