2041200

Appears in sequences

• Averages of twin prime pairs k such that k*7 and k/7 are squares.at n=19A154673
• Smallest number n with ||n-1||-||n|| = k where ||n||=A005245(n) denotes the complexity of n.at n=7A244743
• The sum (in nondecreasing order) of the two numbers in an amicable pair.at n=40A259953
• Irregular triangle read by rows: T(n,k) (0 <= k <= n^2) are coefficients of exact wrapping probability for site percolation on an n X n 2D triangular lattice with periodic boundary conditions. This is for the probability that it wraps in either dimension.at n=50A365953
• Product_{k <= n} (prime(k) + 1)/A001223(k), where A001223 lists the prime gaps, rounded to the nearest integer if necessary.at n=10A390839