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

1,1

Comments

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

Links

Table of n, a(n) for n=1..39.

Formula

A014752 INTERSECT A051644 INTERSECT A107006.

Crossrefs

Subsequence of A122094.

Cf. A014752, A051644, A107006.

Sequence in context: A042874 A221448 A001136 * A142939 A229018 A036335

Adjacent sequences: A256169 A256170 A256171 * A256173 A256174 A256175

Keyword

nonn

Author

Arkadiusz Wesolowski, Jun 01 2015

Status

approved