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A080288
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Successively larger gaps between Ulam numbers.
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4
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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
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refs;
listen;
history;
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OFFSET
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1,2
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COMMENTS
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The lower term of the gaps is in A080287.
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LINKS
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EXAMPLE
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87 and 97 are successive Ulam numbers and this is the first gap of 10 or larger, so 10 is in the sequence.
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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EXTENSIONS
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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(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
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STATUS
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approved
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