143369

Appears in sequences

• Solutions to phi(x + omega(x)) = phi(x) + d(x), where phi() = A000010(), d() = A000005() and omega() = A001221().at n=11A063868
• Numbers k such that A065608(k) = A065608(k+2).at n=25A065064
• Integer k associated with the conjectured record-breaking maximal value A226681(n) of the minimal elements of primitive Collatz-like 3x-k cycles.at n=12A226682
• Integer k associated with the conjectured record-breaking maximal element A226683(n) of primitive 3x-k cycles.at n=12A226684
• Numbers k such that k and k+2 have the same number (A000005) and sum of divisors (A000203).at n=21A229254
• Numbers k such that the sum of the numbers from 1 to k and that from 1 to k+1 share the same sum of divisors.at n=39A375819
• Numbers k such that s(k) = s(k+2), where s(k) is the sum of odd divisors of k (A000593).at n=22A387920