51121

Appears in sequences

• Triangle read by rows: T(n,k) is the number of 2-compositions of n having k odd entries (0<=k<=n) A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.at n=61A181295
• Numbers with digital product = 10.at n=37A199990
• Composite numbers whose product of digits is 10.at n=31A201057
• Numbers n such that (n^n-2)/(n-2) is an integer.at n=41A242787
• Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3.at n=29A318527
• Number of 5-element subsets of [n] having a prime element sum.at n=28A320680