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A200922 Least k such that (3^n - k)*3^n - 1 is a prime number. 5
1, 1, 1, 3, 7, 1, 1, 13, 17, 17, 7, 43, 25, 3, 41, 29, 57, 11, 21, 1, 25, 29, 17, 27, 15, 7, 11, 63, 15, 237, 73, 21, 43, 229, 1, 1, 73, 3, 253, 63, 7, 179, 3, 289, 97, 157, 7, 59, 95, 237, 33, 47, 3, 31, 43, 141, 157, 63, 137, 101, 387, 109, 157, 27, 29, 37 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..66.

MATHEMATICA

Table[k = 0; While[!PrimeQ[(3^n - k)*3^n - 1], k++]; k, {n, 72}]

CROSSREFS

Cf. A191617, A191618, A191619, A191620,A200920, A200921,  A200923.

Sequence in context: A200235 A127929 A228147 * A210453 A003118 A096409

Adjacent sequences:  A200919 A200920 A200921 * A200923 A200924 A200925

KEYWORD

nonn

AUTHOR

Michel Lagneau, Nov 24 2011

STATUS

approved

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Last modified June 22 12:56 EDT 2021. Contains 345380 sequences. (Running on oeis4.)