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A161872 Smallest unhappy number in base n (or 0 if no unhappy numbers in the base). 1
0, 2, 0, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 7, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 5, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

All positive integers are happy numbers in base 2 and base 4; they are called "happy bases". There are no other happy bases < 500,000,000.

LINKS

Table of n, a(n) for n=2..100.

CROSSREFS

Cf. A031177 (Unhappy numbers in base 10)

Sequence in context: A044948 A044949 A044950 * A036461 A244478 A199123

Adjacent sequences:  A161869 A161870 A161871 * A161873 A161874 A161875

KEYWORD

nonn

AUTHOR

Jud McCranie, Jun 20 2009

STATUS

approved

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Last modified November 23 05:04 EST 2014. Contains 249839 sequences.