48399

Appears in sequences

• Numbers k such that sigma(k^2-k-1) = k*(k+1).at n=37A069826
• Engel expansion of Mertens's constant (A077761).at n=13A096167
• a(n) = (8*n+3)*(8*n+5).at n=27A177065
• Coordination sequence for (3,3,6) tiling of hyperbolic plane.at n=22A265073
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + n*b(n), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4, b(2) = 5, and (a(n)) and (b(n)) are increasing complementary sequences.at n=16A296294
• Numbers k such that A353802(k) / sigma(sigma(k)) is an integer > 1, where A353802(n) = Product_{p^e||n} sigma(sigma(p^e)).at n=36A353807