53641

Appears in sequences

• Composite numbers whose prime factors have no digits other than 7's and 9's.at n=20A036324
• Gaps of 8 in sequence A038593 (lower terms).at n=23A038655
• Numbers k such that -3 is a quadratic residue (not necessarily coprime) modulo k, k + 1, k + 2 and k + 3.at n=31A318527