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A228452 Smallest prime k such that k*2^n-1 , k*2^n-1+2*j , k*2^n-1+4*j or k*2^n-1-2*j , k*2^n-1 , k*2^n-1+2*j are consecutive primes in arithmetic progression for some j. 4
3, 53, 19, 3, 19, 593, 313, 113, 1699, 1163, 31, 4217, 31, 47, 7993, 1013, 631, 347, 3793, 3923, 397, 353, 2551, 83, 2719, 971, 3709, 6827, 6361, 593, 2053, 16073, 2719, 2753, 4441, 8663, 31, 131, 61, 5867, 379, 587, 9631, 1907, 8581, 23, 15739, 4049, 2281 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Pierre CAMI, Table of n, a(n) for n = 1..350

Pierre CAMI, PFGW Script

EXAMPLE

53*2^2-1-12=199, 53*2^2-1=211 and 53*2^2-1+12=223, so a(2)=53.

19*2^3-1=151, 19*2^3-1+6=157 and 19*2^3-1+12=163, so a(3)=19.

CROSSREFS

Cf. A227888.

Sequence in context: A202649 A302932 A143387 * A269458 A288867 A082484

Adjacent sequences:  A228449 A228450 A228451 * A228453 A228454 A228455

KEYWORD

nonn

AUTHOR

Pierre CAMI, Oct 27 2013

STATUS

approved

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Last modified January 29 11:16 EST 2020. Contains 331337 sequences. (Running on oeis4.)