367733

Properties

Appears in sequences

• Sophie Germain primes p surrounded by Sophie Germain primes.at n=11A171161
• 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.at n=5A171162
• Primes which are the concatenation of primes p and 2*p-1.at n=1A320442
• a(n) is the number of free n-celled unholey treelike polyominoes.at n=13A350030
• Prime numbersat n=31363