186149

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=12A023302
• Initial (unsafe) primes of Cunningham chains of first type with length exactly 5. Primes in A059453 that survive as primes just four "2p+1 iterations", forming chains of exactly 5 terms.at n=7A059764
• Smallest primes starting a complete four iterations Cunningham chain of the first or second kind.at n=16A110027
• Primes p such that (5*p+2)/3 is the square of a prime.at n=22A357199
• Prime numbersat n=16850