81880

Appears in sequences

• Consider iteration of the function f(x) = sigma(phi(x)) = A062402(x). Sequence lists the numbers k such that the trajectory of k returns to k.at n=41A096998
• Number of n X n arrays of squares of integers with every 3 X 3 subblock summing to 11.at n=2A159211
• Number of n X n arrays of squares of integers with every (n-2)X(n-2) subblock summing to 11.at n=1A159385
• Numerators of the convolutory inverse of the primes of the form 4m+3.at n=8A225128