login
Initial term of n-th group in A079798.
3

%I #6 Nov 16 2019 10:20:20

%S 1,2,4,7,12,34,187,2959,48247,19840327,2510415286599,

%T 521698566186280239802,4471373101273208723788137885117929799,

%U 1253543310663256238898448262146285580160101720412514117844237110599

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

%F For n>1, a(n) = A079801(n-1) + 1. Also, a(n) = (sqrt(8*(A079798(1) + A079798(2) + ... + A079798(n-1)) + 1) + 1) / 2. - _Max Alekseyev_, May 08 2009

%Y Cf. A079798, A079799, A079801, A075633.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Feb 05 2003

%E Extended by _Max Alekseyev_, May 08 2009