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A201132
Least k such that (5^n - k)*5^n - 1 is a prime number.
1
1, 1, 11, 1, 17, 11, 5, 25, 43, 25, 49, 29, 25, 19, 1, 1, 55, 41, 95, 19, 11, 49, 91, 1, 83, 115, 17, 17, 119, 151, 253, 77, 293, 77, 35, 41, 29, 295, 5, 23, 433, 149, 61, 173, 113, 101, 77, 109, 19, 161, 5, 85, 53, 443, 61, 151, 1, 253, 77, 37, 55, 251, 163
OFFSET
1,3
MATHEMATICA
Table[k = 0; While[!PrimeQ[(5^n - k)*5^n - 1], k++]; k, {n, 85}]
CROSSREFS
Sequence in context: A281096 A280506 A222803 * A212488 A373821 A178243
KEYWORD
nonn
AUTHOR
Michel Lagneau, Nov 27 2011
STATUS
approved