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A145838
Primes in A005891 = Centered pentagonal numbers: (5n^2 + 5n + 2)/2.
2
31, 181, 331, 601, 1051, 1381, 3331, 4951, 5641, 5881, 9151, 11731, 12781, 14251, 17431, 17851, 19141, 21391, 31081, 33931, 41281, 43891, 51481, 52201, 61231, 63601, 67651, 70141, 70981, 84181, 92641, 100501, 104551, 107641, 116101, 126001
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Centerd Pentagonal Number
MAPLE
A005891 := proc(n) (5*n*(n+1)+2)/2 ; end: for n from 1 to 1000 do c := A005891(n) ; if isprime(c) then printf("%d, ", c) ; fi; od: # R. J. Mathar, Nov 02 2008
CROSSREFS
Cf. A005891 = Centered pentagonal numbers: (5n^2 + 5n + 2)/2.
Sequence in context: A331759 A325080 A139496 * A373524 A373519 A243522
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Oct 21 2008
EXTENSIONS
More terms from R. J. Mathar, Nov 02 2008
STATUS
approved