A201133 Least k such that (5^n + k)*5^n + 1 is a prime number.

1, 3, 3, 23, 7, 3, 3, 5, 7, 59, 15, 35, 45, 23, 3, 5, 45, 57, 15, 5, 49, 17, 87, 105, 45, 5, 21, 45, 43, 129, 3, 243, 57, 39, 57, 23, 21, 53, 25, 77, 15, 95, 87, 137, 33, 21, 51, 113, 49, 27, 7, 371, 45, 417, 51, 275, 253, 87, 75, 473, 109, 35, 229, 237, 253

Offset

1,2

Links

Table of n, a(n) for n=1..65.

Mathematica

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

Crossrefs

Cf. A191617, A200920.

Sequence in context: A368766 A303228 A255355 * A036114 A369230 A219909

Adjacent sequences: A201130 A201131 A201132 * A201134 A201135 A201136

Keyword

nonn

Author

Michel Lagneau, Nov 27 2011

Status

approved