A079800 Initial term of n-th group in A079798.

1, 2, 4, 7, 12, 34, 187, 2959, 48247, 19840327, 2510415286599, 521698566186280239802, 4471373101273208723788137885117929799, 1253543310663256238898448262146285580160101720412514117844237110599

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Formula

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

Crossrefs

Cf. A079798, A079799, A079801, A075633.

Sequence in context: A360890 A309729 A027945 * A217595 A280028 A094271

Adjacent sequences: A079797 A079798 A079799 * A079801 A079802 A079803

Keyword

nonn

Author

Amarnath Murthy, Feb 05 2003

Extensions

Extended by Max Alekseyev, May 08 2009

Status

approved