A173001 Values of n such that exactly one of 5n+1 and 5n^2+5n+1 is prime.

1, 3, 4, 5, 7, 8, 11, 12, 13, 15, 16, 17, 19, 20, 21, 22, 24, 25, 32, 35, 42, 43, 44, 48, 49, 50, 52, 55, 56, 60, 61, 63, 69, 70, 71, 73, 74, 79, 81, 82, 84, 85, 86, 87, 88, 92, 93, 94, 98, 101, 106, 107, 108, 109, 110, 112, 115, 117, 120, 123, 126, 127, 131, 132, 135, 137

Offset

1,2

Links

Table of n, a(n) for n=1..66.

Crossrefs

Cf. A090563.

Sequence in context: A187689 A137292 A089358 * A325130 A047500 A359822

Adjacent sequences: A172998 A172999 A173000 * A173002 A173003 A173004

Keyword

nonn

Author

Juri-Stepan Gerasimov, Feb 07 2010

Extensions

56 inserted by R. J. Mathar, Mar 09 2010

Status

approved