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A079800 Initial term of n-th group in A079798. 3
1, 2, 4, 7, 12, 34, 187, 2959, 48247, 19840327, 2510415286599, 521698566186280239802, 4471373101273208723788137885117929799, 1253543310663256238898448262146285580160101720412514117844237110599 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

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. [From Max Alekseyev (maxale(AT)gmail.com), May 08 2009]

CROSSREFS

Cf. A079798, A079799, A079801.

Cf. A075633 [From Max Alekseyev (maxale(AT)gmail.com), May 08 2009]

Sequence in context: A141017 A190591 A027945 * A094271 A194422 A177101

Adjacent sequences:  A079797 A079798 A079799 * A079801 A079802 A079803

KEYWORD

nonn

AUTHOR

Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 05 2003

EXTENSIONS

Extended by Max Alekseyev (maxale(AT)gmail.com), May 08 2009

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.