148708

Appears in sequences

• Numbers k such that phi(k) = sigma(k) - sigma(k-1).at n=2A066154
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 1, a(1) = -1, a(2) = -1, a(3) = 2.at n=24A295737