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Search: id:A147802
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| 1, 1, 2, 1, 1, 25, 139, 289, 31, 1, 16096, 49, 7424, 588665, 619115, 83521
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Related to the abc conjecture: Since m is coprime to 3, it is also coprime to 3^n and thus to 3^n-m. Thus A007947(m (3^n-m) 3^n)=3*A007947(m(3^n-m)). See also A143700 for the 2^n analogue and A147300 for the general case.
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PROGRAM
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(PARI) A147802(n, p=3)={local(b, m=n=p^n); for(a=1, (n-1)\2, a%p|next; A007947(n-a)*A007947(a)<m|next; m=A007947((n-a)*b=a)); b}
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CROSSREFS
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Cf. A007947, A147300, A143700.
Sequence in context: A156889 A156725 A141904 this_sequence A093076 A132454 A058293
Adjacent sequences: A147799 A147800 A147801 this_sequence A147803 A147804 A147805
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KEYWORD
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hard,more,nonn
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AUTHOR
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M. F. Hasler (MHasler(AT)univ-ag.fr), Nov 13 2008
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