27899

Appears in sequences

• a(n) = n^3 + n^2 - 1.at n=29A003777
• Denominators of continued fraction convergents to sqrt(428).at n=9A041815
• Least j > 1 for n > 0 such that j^2 = (n^2 + 1)*(k^2) + (n^2 + 1)*k + 1 where k sequence = A106230.at n=30A106229
• a(n) = 900*n - 1.at n=30A158409
• a(n) = index of 2*prime(n) in A381019.at n=38A379811