A094498 Least prime factor of 2^(4*n) + 3^(4*n) = 16^n + 81^n.

97, 17, 97, 3041, 41, 17, 97, 1153, 97, 17, 89, 193, 97, 17, 41, 769, 97, 17, 97, 3041, 97, 17, 97, 1153, 41, 17, 97, 3041, 97, 17, 97, 257, 89, 17, 41, 193, 97, 17, 97, 1153, 97, 17, 97, 353, 41, 17, 97, 769, 97, 17

Offset

1,1

Links

Chai Wah Wu, Table of n, a(n) for n = 1..255

Mathematica

mif[x_]:=Part[Flatten[FactorInteger[x]], 1] Table[mif[16^w+81^w], {w, 1, 20}]
Table[FactorInteger[16^n+81^n][[1, 1]], {n, 50}] (* Harvey P. Dale, Jun 02 2014 *)

Prog

(PARI) a(n) = vecmin(factor(16^n + 81^n)[, 1]); \\ Michel Marcus, Oct 15 2019

Crossrefs

Cf. A082101, A094474-A094494.

Sequence in context: A126840 A247384 A345528 * A068830 A033417 A182690

Adjacent sequences: A094495 A094496 A094497 * A094499 A094500 A094501

Keyword

nonn

Author

Labos Elemer, Jun 02 2004

Extensions

More terms from Harvey P. Dale, Jun 02 2014

Name corrected by Chai Wah Wu, Oct 14 2019

Status

approved