179010

Appears in sequences

• 5-dimensional pyramidal numbers: a(n) = n*(n+1)*(n+2)*(n+3)*(2n+3)/5!.at n=23A005585
• Numbers k such that sigma(phi(sigma(k))) = sigma(k).at n=21A066471
• Numbers k such that sigma(k+1) = 5*phi(k).at n=13A067263