84660

Appears in sequences

• Numbers k such that sopfr(k + omega(k)) = sopfr(k), where sopfr(i) = A001414(i) and omega(i) = A001221(i).at n=40A187878
• E.g.f. satisfies: A(x) = Sum_{n>=0} log(1 + x*A(x)^(3*n))^n/n!.at n=5A221097
• Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum 1 3 6 or 8 and every diagonal and antidiagonal sum not 1 3 6 or 8.at n=11A252009
• Least number k such that 2*k+n | sigma(k) + sigma(k+n), -1 if such a number is unknown.at n=36A281526
• Nonprime numbers k such that A054008(k) = A054024(k).at n=16A343242