

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
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OFFSET

1,2


COMMENTS

The lower term of the gaps is in A080287.


LINKS



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



KEYWORD

nonn,more,hard


AUTHOR



EXTENSIONS

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


STATUS

approved



