19527

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 13 ones.at n=36A031781
• 4n^2+1, 2n^2+1, 2n^2-1 are all prime.at n=40A055755
• Number of arrays of median of three adjacent elements of some length-5 0..n array, with no adjacent equal elements in the latter.at n=25A229013
• Sum of quadratic residues of (n-th prime == 3 mod 4).at n=31A282035
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic residues mod p.at n=15A282723
• a(n) = A159065(n+1) - A334701(n).at n=29A335677
• On a diagonally numbered square grid, with labels starting at 1, this is the number of steps that a (1,n) leaper makes before getting trapped when moving to the lowest available unvisited square, or -1 if it never gets trapped.at n=46A352730