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A106087 Primes p such that 7*p+4 and 4*p+7 are primes. 0
19, 61, 139, 271, 379, 601, 631, 709, 751, 769, 829, 1021, 1069, 1129, 1249, 1291, 1549, 1579, 1621, 1699, 1801, 1831, 2029, 2089, 2251, 2671, 2719, 2791, 2851, 3001, 3049, 3079, 3121, 3259, 3331, 3361, 3559, 3691, 3769, 3919, 4021, 4201, 4219, 4591 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

MATHEMATICA

Select[Prime[Range[220]], PrimeQ[4#+7]&&PrimeQ[7#+4]&]

PROG

(MAGMA) [p: p in PrimesUpTo(10000)| IsPrime(7*p+4) and IsPrime(4*p+7)] \\ Vincenzo Librandi, Nov 13 2010

CROSSREFS

Sequence in context: A338299 A092327 A139498 * A341081 A201812 A262317

Adjacent sequences:  A106084 A106085 A106086 * A106088 A106089 A106090

KEYWORD

nonn

AUTHOR

Zak Seidov, May 07 2005

EXTENSIONS

More terms from Vincenzo Librandi, Apr 01 2010

STATUS

approved

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Last modified October 18 16:57 EDT 2021. Contains 348068 sequences. (Running on oeis4.)