A024701 a(n) = (-1 + prime(n+1)^2)/4.

2, 6, 12, 30, 42, 72, 90, 132, 210, 240, 342, 420, 462, 552, 702, 870, 930, 1122, 1260, 1332, 1560, 1722, 1980, 2352, 2550, 2652, 2862, 2970, 3192, 4032, 4290, 4692, 4830, 5550, 5700, 6162, 6642, 6972, 7482, 8010, 8190, 9120, 9312, 9702, 9900, 11130, 12432, 12882, 13110

Offset

1,1

Links

Table of n, a(n) for n=1..49.

Mathematica

Table[(Prime[n]^2-1)/4, {n, 2, 50}] (* Harvey P. Dale, Feb 12 2019 *)

Crossrefs

Cf. A084921.

Sequence in context: A181826 A143176 A081375 * A224532 A179674 A038199

Adjacent sequences: A024698 A024699 A024700 * A024702 A024703 A024704

Keyword

nonn,easy

Author

Clark Kimberling

Status

approved