141372

Appears in sequences

• Numbers n such that sigma(n) - sigma(reverse(n)) = phi(n).at n=8A071847
• Denominator of the generalized harmonic number H(n,5,2).at n=5A075140
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives x numbers.at n=29A125490
• Numbers n such that sigma(n) = 14*phi(n) (where sigma=A000203, phi=A000010).at n=12A171259
• Three-column table read by rows: Triples that have the same value of phi, sigma, and tau.at n=11A322679
• Three-column table read by rows: Primitive distinct triples that have the same value of phi, sigma, and tau.at n=11A322689
• a(n) = Sum_{p <= n <= q < 2n, p,q prime} (p * q).at n=40A352777
• Numbers k such that binomial(k^2,k) == 0 (mod k^3).at n=21A371474