OFFSET
1,1
COMMENTS
See A066272 for definition of anti-divisor.
Primes p such that 2p + largest anti-divisor of 2p is also prime: 2, 5, 7, 11, 13, 29, 31, 41, 47, 59, 67, 79, 83, 101, 137, 139, 151, 157, 167, 173, 193, 223, 227, 239, 257,...
LINKS
Paolo P. Lava, Table of n, a(n) for n = 1..1000
FORMULA
2 together with primes of the form 4k+1 such that 6k+1 is prime, together with primes of the form 4k+3 such that 6k+5 is prime. - Charles R Greathouse IV, Feb 27 2013
EXAMPLE
The prime 19 is here because it is largest anti-divisor of prime 29.
PROG
(PARI) is(n)=isprime(n)&&isprime(bitor((3*n-1)\2, 1)) \\ Charles R Greathouse IV, Feb 27 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Feb 25 2013
EXTENSIONS
Missing terms a(9), a(21), a(28), a(29) added by Charles R Greathouse IV, Feb 27 2013
STATUS
approved