133787

Appears in sequences

• n-th 6k+1 prime times n-th 6k-1 prime.at n=35A048629
• 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=4A322668
• Numbers k such that k and k+2 have the same deficiency (A033879).at n=4A330901
• Odd numbers k such that phi(k) = phi(k+2), where phi is the Euler totient function (A000010).at n=11A333741
• Numbers k such that k and k+2 have the same unitary abundance (A129468).at n=17A335252