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Search: id:A098731
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A098731 Numbers n such that 2*R_n is a happy number (A007770), where R_n = 11...1 is the repunit (A002275) of length n. +0
1
7, 8, 11, 17, 25, 44, 47, 48, 52, 59, 70, 80, 89, 92, 94, 98, 101, 110, 116, 124, 134, 139, 152, 158, 161, 164, 170, 175, 179, 184, 187, 196, 205, 209, 215, 222, 226, 228, 233, 235, 241, 250, 269, 272, 273, 278, 282, 287, 288, 296, 297, 303, 322, 325, 333, 361 (list; graph; listen)
OFFSET

1,1

EXAMPLE

2*R_11=2*11111111111=22222222222 is a happy number, so 11 is in the list.

CROSSREFS

Cf. A007770, A002275.

Sequence in context: A145826 A102963 A117619 this_sequence A105740 A050796 A106630

Adjacent sequences: A098728 A098729 A098730 this_sequence A098732 A098733 A098734

KEYWORD

easy,nonn

AUTHOR

Lambert Klasen (lambert.klasen(AT)gmx.de), Oct 28 2004

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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