549378

Appears in sequences

• Numbers n such that sigma(n+2) - sigma(n) = prime(n+2) - prime(n).at n=20A067058
• Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 4 and every element equal to at least one neighbor.at n=16A146090
• Numbers k such that (k, k+2) are not twin primes yet sigma(k+2)/d(k+2) - sigma(k)/d(k) = 1.at n=10A322668