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A031177 Numbers having period-8 2-digitized sequences. +0
6
2, 3, 4, 5, 6, 8, 9, 11, 12, 14, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 27, 29, 30, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 83 (list; graph; listen)
OFFSET

0,1

COMMENT

Also known as unhappy numbers. - Gerard Schildberger (gerards(AT)rrt.net), Jun 05 2004

LINKS

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Eric Weisstein's World of Mathematics, Unhappy Number

CROSSREFS

Complement of happy numbers A007770. Cf. A056527.

Sequence in context: A066022 A052047 A078831 this_sequence A164119 A033102 A030749

Adjacent sequences: A031174 A031175 A031176 this_sequence A031178 A031179 A031180

KEYWORD

nonn

AUTHOR

Eric Weisstein (eric(AT)weisstein.com)

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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