login
A309857
Primes p such that 2*p^3+1 is also prime.
2
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
1,1
COMMENTS
All terms == 2 (mod 3). - Robert Israel, Aug 22 2019
LINKS
FORMULA
A000040 INTERSECT A168550.
MAPLE
select(t -> isprime(t) and isprime(2*t^3+1), [2, seq(i, i=5..10000, 6)]); # Robert Israel, Aug 22 2019
CROSSREFS
Cf. A177104 (2*p^3-1 prime), A309856.
Sequence in context: A127331 A040998 A215939 * A117719 A355516 A359661
KEYWORD
nonn
AUTHOR
R. J. Mathar, Aug 20 2019
STATUS
approved