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A227480 Triangular numbers of the form p^2 - 1 where p is a prime. 0
3, 120, 528, 139128, 160554240, 812293020528, 379188080252621270252095320, 2816640597719456759751165488439681098364673273236637971046370174350128 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

139128 is both 527*528/2 and 373^2 - 1 (and 373 is prime).

CROSSREFS

Subsequence of A006454 and of A225115.

Sequence in context: A305364 A304956 A316638 * A304694 A316445 A316127

Adjacent sequences:  A227477 A227478 A227479 * A227481 A227482 A227483

KEYWORD

nonn

AUTHOR

Shreevatsa R, Jul 12 2013

EXTENSIONS

a(7)-a(8) from Giovanni Resta, Jul 13 2013

STATUS

approved

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Last modified October 18 03:25 EDT 2021. Contains 348065 sequences. (Running on oeis4.)