Define Sophie Germain isolated primes to be primes p such that 2p+1 is also prime and so that p-2 and p+2 are not primes. The sequence contains Sophie Germain isolated primes p such that the previous prime to p and the succeeding prime to p are both also Sophie Germain isolated primes.
A171162
Define Sophie Germain isolated primes to be primes p such that 2p+1 is also prime and so that p-2 and p+2 are not primes. The sequence contains Sophie Germain isolated primes p such that the previous prime to p and the succeeding prime to p are both also Sophie Germain isolated primes.
Terms
- a(0) =103619a(1) =145109a(2) =291503a(3) =356591a(4) =362759a(5) =367733a(6) =475523a(7) =521831a(8) =527123a(9) =603191a(10) =609809a(11) =691979a(12) =726419a(13) =810809a(14) =812939a(15) =825491a(16) =940421a(17) =998213a(18) =1117793a(19) =1132811a(20) =1231889a(21) =1329143a(22) =1331789a(23) =1433891a(24) =1433903a(25) =1549403a(26) =1623059
External references
- oeis: A171162