167041

Appears in sequences

• Numerators of continued fraction convergents to sqrt(145).at n=3A041264
• Numerators of continued fraction convergents to sqrt(580).at n=3A042110
• Initial terms of chains consisting of four consecutive integers, for none of which is the value of sigma-function divisible by six.at n=13A097020
• a(n) = 648*n^2 + 72*n + 1.at n=15A154515
• a(n) = 10368*n^2 + 288*n + 1.at n=3A157326
• 128n^2 + 2336n + 10657.at n=26A157433
• a(n) = 2048n^2 + 128n + 1.at n=8A157476
• Numbers k such that sigma((k + 1) / 2) is a prime q.at n=21A292446
• a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} gcd(x_1, x_2, x_3, x_4, n)^4.at n=16A372931