632775

Appears in sequences

• a(n) = n*(2*n^2 + 1)*(n^2 + 1)/6.at n=17A052459
• Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1 and 10*k-1 are primes.at n=26A124488
• a(n) = 3*a(n-1) + 6*a(n-2) + a(n-3), with a(0) = 3, a(1) = 3, and a(2) = 21.at n=9A214778