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.

Showing 1-2 of 2 results.

A287924 Numbers k such that A287922(k) is a prime.

Original entry on oeis.org

2, 3, 4, 6, 7, 12, 15, 19, 21, 25, 27, 33, 38, 39, 44, 51, 59, 62, 63, 65, 66, 69, 74, 90, 93, 96, 101, 106, 108, 111, 112, 123, 132, 138, 143, 144, 147, 153, 162, 163, 166, 168, 181, 187, 188, 203, 219, 224, 229, 241, 243, 255, 258, 259, 269, 273, 300
Offset: 1

Views

Author

XU Pingya, Jun 02 2017

Keywords

Comments

Corresponding primes are in A045637.

Crossrefs

Cf. A287922, A045637.

Programs

  • Mathematica
    Select[Table[n, {n, 300}], PrimeQ[Prime[#]^2 + 4] &]

A287925 a(n) = prime(1)^4 + prime(n)^4.

Original entry on oeis.org

32, 97, 641, 2417, 14657, 28577, 83537, 130337, 279857, 707297, 923537, 1874177, 2825777, 3418817, 4879697, 7890497, 12117377, 13845857, 20151137, 25411697, 28398257, 38950097, 47458337, 62742257, 88529297, 104060417, 112550897, 131079617, 141158177
Offset: 1

Views

Author

XU Pingya, Jun 03 2017

Keywords

Crossrefs

Cf. A030514, A287922.

Programs

  • Mathematica
    Table[Prime[n]^4+2^4, {n, 29}]
Prime[Range[30]]^4+16 (* Harvey P. Dale, May 23 2024 *)

Formula

a(n) = 2^4 + prime(n)^4.
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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