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 A147802 Least m coprime to 3 minimizing A007947(m(3^n-m)). 4
 1, 1, 2, 1, 1, 25, 139, 289, 31, 1, 16096, 49, 7424, 588665, 619115, 83521 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 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 analog and A147300 for the general case. LINKS 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)

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)