A160277 Last terms in the groups defined in A160275.

1, 3, 6, 8, 11, 23, 51, 123, 1451, 165876, 368310548, 131319102413076, 429434116256258636749076, 5044128476605888967010031050325156534548, 998085332225053172931293515663565518940387354129475684145085443611977451

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Formula

a(n) = (sqrt(8*(A160275(1) + A160275(2) + ... + A160275(n)) + 1) - 1) / 2

Crossrefs

Cf. A160275, A160276, A075634, A079801.

Sequence in context: A234307 A175769 A352211 * A080598 A233541 A077148

Adjacent sequences: A160274 A160275 A160276 * A160278 A160279 A160280

Keyword

nonn

Author

Max Alekseyev, May 08 2009

Status

approved