A092411 a(n) = sigma(n,2) + sigma(n+1,2).

6, 15, 31, 47, 76, 100, 135, 176, 221, 252, 332, 380, 420, 510, 601, 631, 745, 817, 908, 1046, 1110, 1140, 1380, 1501, 1501, 1670, 1870, 1892, 2142, 2262, 2327, 2585, 2670, 2750, 3211, 3281, 3180, 3510, 3910, 3892, 4182, 4350, 4412, 4928, 5016, 4860, 5620

Offset

1,1

Links

Table of n, a(n) for n=1..47.

Prog

(PARI) for(i=1, 60, print1(", "sigma(i, 2)+sigma(i+1, 2)))

Crossrefs

Cf. A001157.

Sequence in context: A231814 A056497 A278033 * A272744 A273536 A134506

Adjacent sequences: A092408 A092409 A092410 * A092412 A092413 A092414

Keyword

nonn

Author

Jon Perry, Mar 22 2004

Status

approved