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A234999 Primes p such that the p-th evil numbers is prime; 2 together with evil primes p such that 2p - 1 is prime. 1
2, 3, 139, 337, 547, 619, 691, 811, 937, 1237, 1297, 1399, 1429, 2089, 2179, 2221, 2281, 2467, 2539, 2617, 2707, 2719, 2791, 2851, 3019, 3067, 3499, 3739, 3769, 4027, 4177, 4357, 4447, 4567, 4951, 5431, 5479, 5557, 5581, 5749, 6037, 6229, 6379, 6421, 6691, 6841, 7507 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This sequence is the intersection of A005382 and A027699.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

EXAMPLE

2 is a prime and A001969(2) = 3, a prime also, thus 2 is in this sequence; 3 is a prime and A001969(3) = 5, a prime also, thus 3 is in this sequence; 139 is a prime A001969(139) = 277, a prime also, thus 139 is this sequence.

PROG

(PARI) is(n)=isprime(n) && isprime(2*n--+hammingweight(n)%2) \\ Charles R Greathouse IV, Jan 02 2014

CROSSREFS

Cf. A057738, A232667.

Sequence in context: A118169 A066908 A057738 * A254787 A042073 A124236

Adjacent sequences:  A234996 A234997 A234998 * A235000 A235001 A235002

KEYWORD

nonn

AUTHOR

Antti Karttunen and Juri-Stepan Gerasimov, Jan 02 2014

EXTENSIONS

a(28) inserted by Charles R Greathouse IV, Jan 02 2014

STATUS

approved

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Last modified May 10 03:11 EDT 2021. Contains 343747 sequences. (Running on oeis4.)