810809

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=29A023302
• Primes that remain prime through 5 iterations of function f(x) = 2x + 1.at n=4A023330
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 6.at n=4A059766
• Primes p such that 2p+1, 4p+3, 6p+5, 8p+7 are all primes.at n=25A107021
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, 0), (-1, 0, 1), (0, 1, -1), (1, 0, 0)}.at n=13A148560
• Sophie Germain primes p surrounded by Sophie Germain primes.at n=21A171161
• 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=13A171162
• Sophie Germain primes that are also highly cototient numbers.at n=33A209194
• Prime numbersat n=64747