cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A193813 Least k such that n^n + k + 1 is a prime.

Original entry on oeis.org

0, 0, 1, 0, 11, 6, 3, 42, 9, 18, 61, 34, 15, 26, 27, 12, 73, 106, 17, 90, 31, 86, 13, 94, 95, 42, 67, 134, 119, 18, 57, 6, 57, 62, 53, 30, 41, 114, 9, 156, 109, 12, 3, 402, 121, 456, 533, 36, 17, 30, 225, 252, 19, 192, 101, 176, 391, 44, 193, 256, 101, 78, 453
Offset: 1

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Author

Michel Lagneau, Aug 06 2011

Keywords

Examples

			a(5) = 11 because 5^5 + 11 + 1 = 37 is prime.
		

Crossrefs

Programs

  • Mathematica
    a={};Do[k = 0; While[ !PrimeQ[n^n + k + 1], k++ ]; AppendTo[a, k], {n, 1, 100} ];a
  • PARI
    a(n) = nextprime(n^n) - n^n - 1; \\ Michel Marcus, Aug 20 2019

Formula

a(n) = A098682(n) - n^n -1. - Michel Marcus, Aug 20 2019