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A080288 Successively larger gaps between Ulam numbers. 4
1, 2, 3, 8, 9, 10, 12, 20, 27, 30, 34, 39, 41, 42, 69, 78, 100, 122, 137, 262, 315, 587, 609, 631, 758, 890, 1083, 1092, 1114, 1364, 1373 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The lower term of the gaps is in A080287.
LINKS
Philip Gibbs, Judson McCranie, The Ulam Numbers up to One Trillion, (2017).
EXAMPLE
87 and 97 are successive Ulam numbers and this is the first gap of 10 or larger, so 10 is in the sequence.
CROSSREFS
Sequence in context: A037318 A253317 A277971 * A278560 A217682 A169868
KEYWORD
nonn,more,hard
AUTHOR
Jud McCranie, Feb 12 2003
EXTENSIONS
23rd term found by Don Knuth - Jud McCranie, Aug 22 2008
a(24) on Feb 29 2012; a(25) on Jul 20 2012; and a(26) on Jul 24 2012 found by Jud McCranie;
a(27) found by Philip Gibbs, Sep 02 2015
a(28) found by Philip Gibbs and Jud McCranie, Sep 09 2015
a(29) found by Philip Gibbs, Oct 2017
a(30) found by Philip Gibbs, Oct 16 2017
a(31) found by Philip Gibbs, Oct 20 2017
Missing a(23) inserted by Jud McCranie, Oct 24 2017
STATUS
approved

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Last modified April 22 02:54 EDT 2024. Contains 371887 sequences. (Running on oeis4.)