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A141544
Odd numbers k such that 2k+5 is a prime.
0
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
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
Sequence in context: A111223 A266836 A066207 * A172407 A088649 A020498
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