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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A075633 Initial terms of groups in A075631. 4 1, 2, 3, 6, 19, 99, 307, 9379, 1726174, 13347339102, 321699559882750174, 4716070968330003553938242926174, 23987291841663781653328392594255840802707701158676395299 (list; graph; refs; listen; history; text; internal format) OFFSET 1,2 LINKS Table of n, a(n) for n=1..13. FORMULA For n>1, a(n) = A075634(n-1) + 1. Also, a(n) = (sqrt(8*(A075631(1) + A075631(2) + ... + A075631(n-1)) + 1) + 1) / 2. [From Max Alekseyev, May 08 2009] CROSSREFS Cf. A075631, A075632, A075634. Sequence in context: A364645 A182250 A121959 * A141048 A326030 A124066 Adjacent sequences: A075630 A075631 A075632 * A075634 A075635 A075636 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 August 19 13:48 EDT 2024. Contains 375302 sequences. (Running on oeis4.)