133984

Appears in sequences

• Numbers k such that sigma(k) = 3k - 2*phi(k).at n=11A068414
• Composite numbers k such that k - phi(k) divides sigma(k) - k.at n=19A068418
• Composite n such that n reduced mod(phi(n)) = sigma(n) reduced mod(n).at n=18A068495
• Number of (n+1)X(1+1) 0..5 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 15.at n=5A234201
• Number of (n+1)X(6+1) 0..5 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 15.at n=0A234206
• T(n,k)=Number of (n+1)X(k+1) 0..5 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 15.at n=15A234208
• T(n,k)=Number of (n+1)X(k+1) 0..5 arrays with every 2X2 subblock having the sum of the absolute values of all six edge and diagonal differences equal to 15.at n=20A234208
• Let s(k) denote the sum of the even proper divisors of k. The sequence lists the pairs of numbers (x, y) such that s(x) = y and s(y) = x.at n=18A279812
• List of ordered pairs (x, y) from A279812.at n=19A279950
• Number of strict odd-length integer partitions of 2n.at n=47A344650
• Starts of runs of 4 consecutive integers that are Jacobsthal-Niven numbers (A364216).at n=17A364219