61131

Appears in sequences

• Numbers k such that k and k^2 use only the digits 1, 3, 6, 7 and 9.at n=20A137039
• Numbers n such that (n^6 + 1091)/4 is prime.at n=29A181112
• Numbers k such that phi(k) = phi(k+2) - phi(k+1).at n=26A229552
• Numbers n such that phi(n)*sigma(n) = phi(n+1)*sigma(n+1).at n=13A244439
• Convolution of A000009 and A000290.at n=27A360487