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.

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A225517 Integers n > 1 such that expression n!/(prime(n-1)+1) is not an integer.

Original entry on oeis.org

2, 3, 13, 19, 22, 38, 39, 45, 48, 60, 62, 66, 68, 79, 83, 89, 100, 101, 102, 113, 122, 123, 126, 131, 135, 139, 152, 156, 169, 178, 184, 189, 192, 194, 195, 197, 198, 199, 204, 217, 219, 221, 222, 228, 232, 243, 256, 258, 261, 266, 270, 274, 286, 288, 289, 292
Offset: 1

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Crossrefs

Cf. A223881.

Programs

  • Mathematica
    Select[Range[2, 522], ! IntegerQ[#!/(Prime[# - 1] + 1)] &] (* T. D. Noe, May 10 2013 *)
  • PARI
    m=M=1; forprime(p=2, 1e5, M*=m++; t=denominator(M/(p+1)); if(t>1, print1(m", ")))
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