1021693

Appears in sequences

• Fibonacci sequence beginning 1, 13.at n=25A022103
• Numbers m such that there exists at least one integer k < m such that m^2+1 and k^2+1 have the same prime factors.at n=18A282092
• Pairs of integers (x, y), such that x^2 + 1 and y^2 + 1, 1 < y < x, have the same distinct prime factors.at n=36A284477
• Number of subwords of the form UUUD in nondecreasing Dyck paths of length 2n.at n=15A377857