Prime intersections in a square spiral with positive integers: primes p such that there are four primes among eight nearest neighbors of p.
A215470
Prime intersections in a square spiral with positive integers: primes p such that there are four primes among eight nearest neighbors of p.
Terms
- a(0) =71a(1) =353a(2) =701a(3) =1151a(4) =1451a(5) =3347a(6) =4691a(7) =13463a(8) =21017a(9) =27947a(10) =34337a(11) =42017a(12) =52253a(13) =57191a(14) =79907a(15) =80831a(16) =81611a(17) =121469a(18) =144497a(19) =159737a(20) =161141a(21) =256301a(22) =265547a(23) =284231a(24) =285707a(25) =312161a(26) =334511a(27) =346559a(28) =348617a(29) =382601
External references
- oeis: A215470