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A147800
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Minimal value of A007947(m(5^n-m)) with m coprime to 5.
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4
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2, 6, 22, 42, 222, 366, 2046, 13962, 10626, 79926, 293262
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The minima are reached for m values given in A147803.
This is related to the abc conjecture, see also A143702, A147801 (2^n, 3^n analogues) and A147298 (general case).
All terms of this sequence are even, so one could also consider A147800/2 = 1, 3, 11, 21, 111, 183, 1023, 6981, 5313, 39963, 146631,...
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PROG
| (PARI) A147800(n, p=5)={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, A147803 (m values), A143702 (analogue for 2^n), A147801 (analogue for 3^n), A147298 (general case).
Sequence in context: A129534 A085286 A062085 * A027561 A126171 A002839
Adjacent sequences: A147797 A147798 A147799 * A147801 A147802 A147803
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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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