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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A181283 Numbers n with property that (n+1)*prime(n+1)-n*prime(n) is a perfect square s^2.

Original entry on oeis.org

1, 2, 24, 45, 58, 64, 135, 168, 287, 325, 455, 601, 1506, 1965, 1990, 2070, 2189, 2428, 3967, 4017, 4388, 4895, 6966, 7419, 9252, 10144, 10242, 10618, 12980, 14175, 14385, 14740, 15140, 18724, 22424, 24203, 24935, 24989, 25171, 25974, 27817, 29688
Offset: 1

Views

Author

Zak Seidov, Oct 12 2010

Keywords

Crossrefs

Cf. A175897.

Programs

  • Mathematica
    Select[Range[30000],IntegerQ[Sqrt[(#+1)Prime[#+1]-# Prime[#]]]&] (* Harvey P. Dale, Mar 20 2012 *)
  • PARI
    a=2;{for(n=1,10^5,b=nextprime(a+1);issquare((n+1)*b-n*a)&print(n);a=b)}

Formula

{n,s}:{1,2},{2,3},{24,17},{45,17},{58,25},{64,21},{135,43},{168,55},{287,55}.
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