71807

Properties

Appears in sequences

• Primes that remain prime through 4 iterations of function f(x) = 2x + 3.at n=22A023303
• L.g.f.: log( Sum_{n>=0} Product_{k=1..n} ((1+x)^k - 1) ) = Sum_{n>=1} a(n)*x^n/n.at n=6A207434
• Indices of prime Fibonacci 5-step numbers, A001591.at n=15A248757
• Consider constructing binary words that begin with 0 such that the subword 00, whenever it appears, is followed by 111. Then a(n) counts such words at length n (including those where the string 111 is yet being completed - see Example).at n=21A340215
• Prime numbersat n=7106