27850

Appears in sequences

• Numbers n such that n*359# +-1 are twin primes, where 359# = 72nd primorial (A002110(72)).at n=25A087907
• Triangle, read by rows, equal to the matrix square of A113370. Also given by the product: P^2 = Q*(R^-2)*Q^3, using triangular matrices P=A113370, Q=A113381 and R=A113389.at n=16A113374
• Column 1 of triangle A113374, also equals column 0 of A113381^4.at n=4A113376
• Triangle, read by rows, given by the product R^3*P^-1 using triangular matrices P=A113370, R=A113389.at n=10A114152
• Numbers n such that 11^n - 2 is prime.at n=4A133982
• Number of symmetry classes of 3 X 3 magilatin squares with positive values < n.at n=21A173729
• a(n) = prime(n)^2 - n.at n=38A182174
• Number of cycles in the n-Apollonian network.at n=2A302718
• G.f. A(x) satisfies: A(x) = A(x^2 + 2*x^3) / x.at n=16A389536