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A147802
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Least m coprime to 3 minimizing A007947(m(3^n-m))
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4
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1, 1, 2, 1, 1, 25, 139, 289, 31, 1, 16096, 49, 7424, 588665, 619115, 83521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| 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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PROG
| (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
| Cf. A007947, A147300, A143700.
Sequence in context: A172177 A156725 A141904 * A093076 A132454 A182911
Adjacent sequences: A147799 A147800 A147801 * A147803 A147804 A147805
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KEYWORD
| hard,more,nonn
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Nov 13 2008
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