69003

Appears in sequences

• a(n) = Sum_{d|3} phi(d)*n^(3/d).at n=41A054602
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+17)^2 = y^2.at n=15A118120
• a(n) = 7*a(n-1) - 7*a(n-2) + a(n-3) for n > 2; a(0) = 0, a(1) = 51, a(2) = 340.at n=5A155464
• a(n) = smallest k having at least four prime divisors d such that (d + n) | (k + n).at n=16A202159
• The Wiener index of the ortho-polyphenyl chain with n hexagons (see the Dou et al. and the Deng references).at n=16A216108