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A147801
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Minimal value of A007947(m(3^n-m)) with m coprime to 3.
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5
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2, 2, 10, 10, 22, 110, 278, 238, 1054, 1342, 11066, 6118, 18734, 107030, 557270, 163030
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Related to the abc conjecture. The minima are reached for m values given in A147802. See also A143702, A147800 (2^n, 5^n analogues) and A147298 (general case).
All terms of this sequence are even, so one could also consider A147801/2 = 1, 1, 5, 5, 11, 55, 139, 119, 527, 671, 5533, 3059, 9367, 53515, 278635, 81515,...
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PROG
| (PARI) A147801(n, p=3)={local(m=n=p^n); for(a=1, (n-1)\2, a%p|next; A007947(n-a)*A007947(a)<m|next; m=A007947((n-a)*a)); m}
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CROSSREFS
| Cf. A007947, A147298, A143702 (analogue for 2^n), A147800 (analogue for 5^n).
Sequence in context: A019241 A168295 A032005 * A066965 A066966 A132443
Adjacent sequences: A147798 A147799 A147800 * A147802 A147803 A147804
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KEYWORD
| more,nonn
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AUTHOR
| M. F. Hasler (www.univ-ag.fr/~mhasler), Nov 13 2008
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