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A160277
Last terms in the groups defined in A160275.
3
1, 3, 6, 8, 11, 23, 51, 123, 1451, 165876, 368310548, 131319102413076, 429434116256258636749076, 5044128476605888967010031050325156534548, 998085332225053172931293515663565518940387354129475684145085443611977451
OFFSET
1,2
FORMULA
a(n) = (sqrt(8*(A160275(1) + A160275(2) + ... + A160275(n)) + 1) - 1) / 2
CROSSREFS
KEYWORD
nonn
AUTHOR
Max Alekseyev, May 08 2009
STATUS
approved