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A201134 Least k such that (5^n + k)*5^n - 1 is a prime number. 1
1, 17, 1, 1, 5, 5, 55, 25, 37, 1, 53, 5, 53, 35, 47, 31, 127, 11, 1, 17, 11, 59, 71, 5, 155, 23, 11, 1, 13, 47, 43, 71, 17, 77, 53, 41, 13, 277, 47, 5, 143, 185, 157, 371, 43, 127, 119, 61, 221, 79, 131, 19, 49, 241, 7, 121, 11, 551, 157, 335, 13, 17, 13 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..63.

MATHEMATICA

Table[k = 0; While[!PrimeQ[(5^n + k)*5^n - 1], k++]; k, {n, 85}]

CROSSREFS

Cf. A191618, A200921.

Sequence in context: A040294 A040291 A040290 * A040289 A190580 A176203

Adjacent sequences:  A201131 A201132 A201133 * A201135 A201136 A201137

KEYWORD

nonn

AUTHOR

Michel Lagneau, Nov 27 2011

STATUS

approved

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Last modified March 22 01:06 EDT 2019. Contains 321406 sequences. (Running on oeis4.)