A203269 Row sums of triangle A202917.

1, 2, 8, 4, 132, 24, 1556, 88, 5364, 168, 5612, 136, 1128168, 28656, 86804, 1672, 3434920, 48080, 173886368, 2462176, 4093653652, 62126504, 4292224444, 10991336, 182512332988, 4948498616

Offset: 0

Author

Vladimir Shevelev and Peter J. C. Moses, Dec 31 2011

Keywords

• nonn

Comments

If p is prime, then a(p-1)==2 mod p. At least up to n=251, there is only one nonprime n for which a(n-1)==2 mod n. It is n=18 for which a(18-1)=48080==2(mod 18).

Crossrefs

Cf. A202917, A202941.