147890

Appears in sequences

• Numbers k such that sigma(k) = phi(k+1) + phi(k) + phi(k-1).at n=25A065986
• G.f.: A(x) = Product_{n>=1} [ (1-x)^5*(1 + 5x + 15x^2 +...+ n(n+1)(n+2)(n+3)/4!*x^(n-1)) ].at n=9A129358
• Numbers k such that (17*10^k + 79)/3 is prime.at n=28A273728
• Expansion of Product_{k>=1} 1/((1 - x^(2*k-1))^(k*(3*k-1)/2)*(1 - x^(2*k))^(k*(3*k+1)/2)).at n=17A294591