127297

Properties

Appears in sequences

• E.g.f.: tanh(arcsin(arctan(x))), odd powers only.at n=4A012094
• Sequence of primes 2*p(k) + 3 such that 2*p(k) + 3, 2*p(k+1) + 3, 2*p(k+2) + 3 are consecutive primes, where p(i) denotes the i-th prime. Sequence terms are 2*p(k) + 3.at n=5A089450
• G.f. A(x) equals the composition of functions x*(1 + a(n)*x^n); let F_1(x) = x, F_{n+1}(x) = F_n( x*(1 + a(n)*x^n) ), then A(x) = limit F_n(x): A(x) = x*(1+a(1)*x) o x*(1+a(2)*x^2) o ... o x*(1+a(n)*x^n) o ...at n=13A119472
• Coefficient of x^2 in the reduction of the polynomial (x+2)^n by x^3->x^2+x+1.at n=10A192803
• Indices of tetrahedral numbers that are Fermat pseudoprimes to base 2.at n=8A321866
• Prime numbersat n=11926