439097

Appears in sequences

• Lesser of a pair (x,y) of consecutive terms of A045572 (numbers coprime to 2*5), both semiprimes and such that the prime factors of x are adjacent primes to the factors of y.at n=6A213605
• The lesser of two semiprime brothers.at n=19A289548
• Numbers k such that (k, k+2) are not twin primes yet sigma(k+2)/d(k+2) - sigma(k)/d(k) = 1.at n=7A322668
• Numbers k such that k and k+2 have the same deficiency (A033879).at n=7A330901
• Odd numbers k such that phi(k) = phi(k+2), where phi is the Euler totient function (A000010).at n=22A333741
• Numbers k such that k and k+2 have the same unitary abundance (A129468).at n=25A335252