66749

Properties

Appears in sequences

• Primes that remain prime through 3 iterations of the function f(x) = 2*x + 1.at n=30A023272
• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=7A023302
• 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=4A059764
• Prime(prime(n)) when prime(prime(n)) and n are twin primes.at n=27A087394
• Smallest primes starting a complete four iterations Cunningham chain of the first or second kind.at n=9A110027
• a(n) = 2 + floor((1 + Sum_{j=1..n-1} a(j))/3).at n=36A120149
• Primes of the form 10*k^2+14*k+5, k >= 0.at n=35A154412
• Euler transform of square powers of 2: [2,2^4,2^9,...,2^(n^2),...].at n=4A158099
• Primes which contain the fax number of the beast (667).at n=29A321001
• Prime numbersat n=6653