150419

Appears in sequences

• Solutions to phi(x + omega(x)) = phi(x) + d(x), where phi() = A000010(), d() = A000005() and omega() = A001221().at n=12A063868
• Numbers k such that A065608(k) = A065608(k+2).at n=26A065064
• Numbers k such that k and k+2 have the same number (A000005) and sum of divisors (A000203).at n=22A229254
• Numbers k such that s(k) = s(k+2), where s(k) is the sum of odd divisors of k (A000593).at n=24A387920