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A181551 The largest k corresponding to n=A181542(.) such that 3^n-3^k-1 and 3^n-3^k+1 are twin primes. 1
1, 2, 2, 6, 10, 15, 17, 22, 30, 42, 100, 77, 96, 103, 120, 94, 141, 206, 339, 548, 843, 1409, 978, 1198, 1920, 2837, 5377 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..27.

CROSSREFS

Cf. A181515, A181523, A181542

Sequence in context: A080460 A080456 A077017 * A127404 A292037 A184842

Adjacent sequences:  A181548 A181549 A181550 * A181552 A181553 A181554

KEYWORD

nonn

AUTHOR

Pierre CAMI, Jan 29 2011

STATUS

approved

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Last modified December 7 17:41 EST 2019. Contains 329847 sequences. (Running on oeis4.)