A301812 - OEIS

A301812

Numbers of the form p^2 - 1 where p is a prime of the form 3*k-1 (A003627).

3, 24, 120, 288, 528, 840, 1680, 2208, 2808, 3480, 5040, 6888, 7920, 10200, 11448, 12768, 17160, 18768, 22200, 27888, 29928, 32040, 36480, 38808, 51528, 54288, 57120, 63000, 66048, 69168, 72360, 78960, 85848, 96720, 100488, 120408, 124608, 128880, 146688

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..39.

FORMULA

a(n) = A003627(n)^2 - 1. - Altug Alkan, Mar 28 2018

MAPLE

A301812List := proc(len) local p, n, L; L := 3; p := 5;

for n from 2 to len do if isprime(p) then L := L, (p^2 - 1) fi;

p := p + 6; od: L end:

A301812List(65);