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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A309857 Primes p such that 2*p^3+1 is also prime.

Original entry on oeis.org

2, 5, 11, 29, 59, 71, 107, 149, 191, 197, 227, 269, 431, 479, 491, 857, 941, 1019, 1049, 1217, 1259, 1289, 1451, 1601, 1619, 1667, 1709, 1847, 2081, 2237, 2267, 2447, 2549, 2579, 2699, 2711, 2729, 2861, 2879, 2957, 3041, 3089, 3167, 3191, 3209, 3221, 3407, 3719, 3761, 3779
Offset: 1

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Author

R. J. Mathar, Aug 20 2019

Keywords

Comments

All terms == 2 (mod 3). - Robert Israel, Aug 22 2019

Crossrefs

Cf. A177104 (2*p^3-1 prime), A309856.

Programs

  • Maple
    select(t -> isprime(t) and isprime(2*t^3+1), [2, seq(i,i=5..10000,6)]); # Robert Israel, Aug 22 2019

Formula

A000040 INTERSECT A168550.
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