20136

Appears in sequences

• a(n) = 839*n.at n=24A135639
• Triangle T(n, k) = k*(n-1)! - k!, read by rows.at n=31A137260
• Numbers k such that k^2 + 1 divides 2^k + 1.at n=4A247220
• Terms of A143407, sorted.at n=41A270564
• Number of n X 6 0..1 arrays with every element equal to 2, 3, 6 or 8 king-move adjacent elements, with upper left element zero.at n=12A298175
• Triangle lc(n,k): the number of purely line-connected k-partitions of [n], n>=4, 3<=k<n.at n=23A305874
• Expansion of (1/(1 - x)) * Sum_{k>=1} k*x^k/(x^k + (1 - x)^k).at n=11A320586
• a(n) = smallest k such that Sum_{i=1..k} log(p_i)/p_i >= n, where p_i is the i-th prime.at n=10A347310
• Numbers such that the two numbers before and the two numbers after are squarefree semiprimes.at n=37A358666