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A138656 Primes p such that 42*p-1 and 42*p+1 are twin primes. 0
11, 31, 41, 101, 131, 211, 239, 331, 419, 421, 509, 619, 691, 751, 769, 1091, 1129, 1279, 1531, 1571, 1609, 1901, 2111, 2221, 2251, 2281, 2341, 2699, 2719, 2879, 2971, 3221, 3541, 3671, 3821, 3851, 4271, 4349, 4421, 4519, 4561, 4651, 4861, 4909, 4969 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

EXAMPLE

42*11-1=461, 42*11+1=463; 42*31-1=1301, 42*31+1=1303; ...

MATHEMATICA

a=42; Select[Prime[Range[10^3]], PrimeQ[a*#-1]&&PrimeQ[a*#+1]&]

CROSSREFS

Sequence in context: A061599 A153128 A040971 * A144234 A109548 A173767

Adjacent sequences:  A138653 A138654 A138655 * A138657 A138658 A138659

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, May 15 2008

STATUS

approved

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Last modified October 18 05:31 EDT 2019. Contains 328146 sequences. (Running on oeis4.)