21659

Appears in sequences

• Fibonacci sequence beginning 8, 17.at n=16A022390
• Growth function of an infinite cubic graph (number of nodes at distance <=n from fixed node).at n=36A038621
• n for which floor((3/2)^n) is prime.at n=26A070759
• Convoluted convolved Fibonacci numbers G_j^(8).at n=9A089095
• Triangle read by rows: T(n, k) = number of hill-free Dyck paths (i.e., no peaks at height 1) of semilength n and having k peaks.at n=59A100754
• Triangle read by rows: T(n, k) = number of hill-free Dyck paths (i.e., no peaks at height 1) of semilength n and having k peaks.at n=61A100754
• Numbers k such that (2*k)!/(2*(k!)^2) - 1 is prime.at n=27A112861
• Number of 11-almost primes 11ap such that 2^n < 11ap <= 2^(n+1).at n=23A120042
• a(n) = 60*n^2 - 1.at n=18A158670
• Numbers n such that the sum of the non-anti-divisors of n is a multiple of the sum of the anti-divisors of n.at n=17A245649
• Fixed points of permutations A262323 and A262255.at n=13A262367
• Indices of primes followed by a gap (distance to next larger prime) of 44.at n=22A320720