A079801 Final term of n-th group in A079798.

1, 3, 6, 11, 33, 186, 2958, 48246, 19840326, 2510415286598, 521698566186280239801, 4471373101273208723788137885117929798, 1253543310663256238898448262146285580160101720412514117844237110598

Offset

1,2

Links

Table of n, a(n) for n=1..13.

Formula

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

Crossrefs

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

Sequence in context: A101958 A153982 A119367 * A280259 A119104 A180483

Adjacent sequences: A079798 A079799 A079800 * A079802 A079803 A079804

Keyword

nonn

Author

Amarnath Murthy, Feb 05 2003

Extensions

Extended by Max Alekseyev, May 08 2009

Status

approved