A214718 - OEIS

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A214718

Least m>0 such that 5^n-m and n-m are relatively prime.

1

2, 1, 2, 2, 4, 1, 2, 1, 2, 2, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 2, 4, 1, 2, 1, 2, 2, 4, 1, 2, 1, 2, 2, 4, 2, 2, 1, 2, 2, 4, 1, 4, 1, 2, 2, 4, 1, 2, 1, 2, 2, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 2, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 2, 4, 2, 2, 1, 2, 2, 4, 1, 2, 1, 2

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OFFSET

1,1

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

EXAMPLE

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A377230 A255723 A309022 * A367970 A345161 A321319

Adjacent sequences: A214715 A214716 A214717 * A214719 A214720 A214721

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jul 27 2012

STATUS

approved