31925

Appears in sequences

• Define C(n) by the recursion C(0) = 5*i where i^2 = -1, C(n+1) = 1/(1 + C(n)), then a(n) = 5*(-1)^n/Im(C(n)) where Im(z) denotes the imaginary part of z.at n=9A069962
• G.f.: Sum_{n>=0} 4^n * x^n / (1-x)^(2*n+1) * [Sum_{k=0..n} C(n,k)^2 * x^k]^2.at n=5A246540
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 203", based on the 5-celled von Neumann neighborhood.at n=36A270727
• a(n) = Sum_{k = n..2*n+1} k^2.at n=23A299646
• Numbers k in A228058 such that also A001065(k) is in A228058.at n=39A325380
• a(n) = smallest k such that li(k) - pi(k) >= n, where li(k) is the logarithmic integral and pi(x) is the number of primes <= x.at n=35A359145
• Indices of records in A255933.at n=7A392028