A256172 Primes of the form 6*p + 1 with p prime that are also of the form x^2 + 27*y^2 and congruent to 7 mod 24.

31, 223, 439, 1399, 2383, 2767, 3343, 3463, 3607, 4567, 6079, 7927, 8167, 8287, 8719, 10159, 10663, 11959, 14503, 15559, 15727, 17383, 18223, 19087, 20743, 21487, 21559, 24007, 25639, 26647, 27103, 27583, 28807, 28879, 29167, 29599, 31183, 32359, 33343

Offset: 1

Author

Arkadiusz Wesolowski, Jun 01 2015

Keywords

• nonn

Comments

a(n) divides 2^m - 1, where m = (a(n) - 7)/6 + 1.

Crossrefs

Subsequence of A122094.

Cf. A014752, A051644, A107006.

Formula

A014752 INTERSECT A051644 INTERSECT A107006.