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A075634 Final terms of groups in A075631. 5
1, 2, 5, 18, 98, 306, 9378, 1726173, 13347339101, 321699559882750173, 4716070968330003553938242926173, 23987291841663781653328392594255840802707701158676395298 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

FORMULA

a(n) = A075633(n+1) - 1. Also, a(n) = (sqrt(8*(A075631(1) + A075631(2) + ... + A075631(n)) + 1) - 1) / 2. [From Max Alekseyev, May 08 2009]

CROSSREFS

Cf. A075631, A075632, A075633.

Sequence in context: A075441 A187008 A333837 * A322396 A007127 A279207

Adjacent sequences:  A075631 A075632 A075633 * A075635 A075636 A075637

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 30 2002

EXTENSIONS

More terms from Jonathan Cross (jcross(AT)juggler.net), May 08 2004

One more term from Max Alekseyev, May 08 2009

STATUS

approved

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Last modified May 17 16:03 EDT 2021. Contains 343980 sequences. (Running on oeis4.)