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Last terms in the groups defined in A160275.
3

%I #2 Mar 30 2012 17:27:02

%S 1,3,6,8,11,23,51,123,1451,165876,368310548,131319102413076,

%T 429434116256258636749076,5044128476605888967010031050325156534548,

%U 998085332225053172931293515663565518940387354129475684145085443611977451

%N Last terms in the groups defined in A160275.

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

%Y Cf. A160275, A160276, A075634, A079801.

%K nonn

%O 1,2

%A _Max Alekseyev_, May 08 2009