167729

Properties

Appears in sequences

• a(n) = ((n+1)-st Lucas number) - (n-th non-Lucas number).at n=23A014243
• Primes that remain prime through 4 iterations of function f(x) = 2x + 1.at n=11A023302
• 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=6A059764
• Smallest primes starting a complete four iterations Cunningham chain of the first or second kind.at n=15A110027
• Primes 10k + 9 at the end of the maximal gaps in A269261.at n=11A269263
• Prime numbersat n=15318