A214719 - OEIS

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A214719

Least m>0 such that 6^n-m and n-m are relatively prime.

0

2, 1, 1, 1, 1, 5, 1, 3, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 3, 1, 1, 1, 3, 1, 1, 1, 1, 2, 1, 1, 1, 1, 5, 1, 1, 1, 1, 3, 1, 1, 1, 1, 3, 1, 1, 1, 3, 2, 1, 1, 1, 1, 3, 1, 1, 1, 1, 2, 1, 1, 3, 1, 5, 1, 1, 1, 1, 3, 1, 1, 1, 1, 3, 1, 5, 1, 1, 2, 1, 1, 1, 1, 3, 2

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..87.

EXAMPLE

gcd(6^8-1,7) = 7, gcd(6^8-2,6) = 2, gcd(6^8-3,5) = 1, so a(8) = 3.

MATHEMATICA

Table[m = 1; While[GCD[5^n - m, n - m] != 1, m++]; m, {n, 1, 140}]

CROSSREFS

Sequence in context: A275069 A181937 A233836 * A356299 A327858 A307372

Adjacent sequences: A214716 A214717 A214718 * A214720 A214721 A214722

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jul 27 2012

STATUS

approved