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Final term of n-th group in A079798.
4

%I #6 Nov 16 2019 10:19:07

%S 1,3,6,11,33,186,2958,48246,19840326,2510415286598,

%T 521698566186280239801,4471373101273208723788137885117929798,

%U 1253543310663256238898448262146285580160101720412514117844237110598

%N Final term of n-th group in A079798.

%F For n>1, a(n) = A079800(n+1) - 1. Also, a(n) = (sqrt(8*(A079798(1) + A079798(2) + ... + A079798(n)) + 1) - 1) / 2. - _Max Alekseyev_, May 08 2009

%Y Cf. A079798, A079799, A079800, A075634, A160277.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Feb 05 2003

%E Extended by _Max Alekseyev_, May 08 2009