A067662 Numbers n such that n^2 + 1 and n^4 + 1 are primes.

1, 2, 4, 6, 16, 20, 24, 54, 56, 74, 90, 160, 180, 204, 210, 340, 430, 436, 466, 556, 584, 690, 760, 930, 936, 966, 986, 1144, 1150, 1246, 1406, 1434, 1586, 1644, 1700, 1824, 1850, 1870, 1910, 2074, 2126, 2224, 2260, 2266, 2336, 2360, 2536, 2604, 2646, 2676

Offset: 1

Author

Benoit Cloitre, Feb 23 2002

Keywords

• nonn

Links

• Giovanni Resta, Table of n, a(n) for n = 1..10000 (first 5000 terms from Seiichi Manyama)

Crossrefs

Intersection of A000068 and A005574.

Programs

Magma

[n: n in [0..10000]| IsPrime(n^2+1) and IsPrime(n^4+1)] // Vincenzo Librandi, Aug 07 2010