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Search: id:A081258
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A081258 Numbers n such that n^3-1 (or equivalently n^2+n+1) has no prime factor greater than n. +0
3
16, 18, 22, 30, 49, 67, 68, 74, 79, 81, 87, 100 (list; graph; listen)
OFFSET

1,1
EXAMPLE

16^3-1 = 4095 = 3*3*5*7*13

CROSSREFS

Cf. A081256, A081257.

Sequence in context: A065426 A031168 A097746 this_sequence A057369 A117100 A101848

Adjacent sequences: A081255 A081256 A081257 this_sequence A081259 A081260 A081261

KEYWORD

easy,nonn

AUTHOR

Jan Fricke (fricke(AT)uni-greifswald.de), Mar 14 2003

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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