A141544 Odd numbers k such that 2k+5 is a prime.

1, 3, 7, 9, 13, 19, 21, 27, 31, 33, 37, 39, 49, 51, 61, 63, 67, 73, 79, 81, 87, 93, 97, 103, 109, 111, 117, 123, 129, 133, 139, 151, 153, 163, 171, 177, 181, 187, 189, 207, 213, 217, 219, 229, 231, 237, 241, 243, 247, 249, 259, 271, 279, 283, 291, 297, 301, 307

Offset

1,2

Comments

Superset of A107771. The corresponding primes are given by deleting the first entry in A002145. - R. J. Mathar, Aug 18 2008

Links

Table of n, a(n) for n=1..58.

Formula

A089038 INTERSECT A005408. - R. J. Mathar, Aug 18 2008

a(n) = A087915(n+1) - 1 = A090670(n+1) - 4. - Giovanni Teofilatto, Sep 07 2008

Maple

a:=proc(n) if isprime(2*n+5)=true then n else end if end proc: seq(a(2*n-1), n=1..170); # Emeric Deutsch, Aug 17 2008

Crossrefs

Cf. A020498, A089038.

Sequence in context: A111223 A266836 A066207 * A172407 A088649 A020498

Adjacent sequences: A141541 A141542 A141543 * A141545 A141546 A141547

Keyword

nonn

Author

Giovanni Teofilatto, Aug 16 2008

Extensions

Extended by Emeric Deutsch, Aug 17 2008 and R. J. Mathar, Aug 18 2008

Status

approved