A145838 - OEIS

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A145838

Primes in A005891 = Centered pentagonal numbers: (5n^2 + 5n + 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 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..36.` `Eric Weisstein's World of Mathematics, Centerd Pentagonal Number`
	MAPLE	`A005891 := proc(n) (5n(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: A142140 A325080 A139496 * A243522 A227523 A055788` `Adjacent sequences: A145835 A145836 A145837 * A145839 A145840 A145841`
	KEYWORD	`nonn`
	AUTHOR	`Alexander Adamchuk, Oct 21 2008`
	EXTENSIONS	`More terms from R. J. Mathar, Nov 02 2008`
	STATUS	`approved`

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Last modified December 6 21:43 EST 2019. Contains 329809 sequences. (Running on oeis4.)