781926

Appears in sequences

• Number of 2 X 2 matrices with all elements in {0,1,...,n} and odd determinant.at n=37A210370
• Sequence lists numbers k > 1 such that k^2 == phi(k) (mod sigma(k)), where phi = A000010 and sigma = A000203.at n=37A324214
• Square array read by antidiagonals upwards in which T(n,m) is the n-th number whose symmetric representation of sigma consists of m copies of unimodal pattern 121 (separated by 0's if m > 1).at n=25A372180