18045

Appears in sequences

• Numbers k such that k-4, k-2, k+2 and k+4 are prime.at n=16A173037
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows.at n=49A173046
• Triangle T(n, k, q) = binomial(n, k) + q^n*binomial(n-2, k-1) - 1 with T(n, 0) = T(n, n) = 1 and q = 2, read by rows.at n=50A173046
• Partial sums of floor(n^3/2).at n=19A173704
• a(n) = n! * [x^n] (exp(x)+x)^n.at n=5A245496
• Numbers k > 0 such that either 3*k+4, k-2, k+2, n+k or 3*k+5, k-1, k+1, k+5 are all primes.at n=43A290130
• Numbers k(n) used for Markoff forms determining quadratic irrationals with purely periodic continued fractions.at n=19A305311