47050

Appears in sequences

• Indices of primes in sequence defined by A(0) = 49, A(n) = 10*A(n-1) - 11 for n > 0.at n=7A101733
• Transform of the finite sequence (1, 0, -1, 0, 1) by the T_{0,0} transform (see link).at n=14A159348
• Sum of squares of cycle lengths for different cycles in Fibonacci-like sequences modulo n.at n=25A233246
• Numbers k such that prime(k) * 2^k - 1 is prime.at n=23A239741
• Triangle read by rows: T(n,m) (n >= m >= 1) = number of regions (or cells) formed by drawing the line segments connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares.at n=53A331452
• E.g.f. satisfies A(x) = 1/(1 - x * exp(x*A(x)^2))^2.at n=5A377552