226253

Appears in sequences

• (1/binomial(0,0) - 1/binomial(2,1) + ... + d/binomial(2n,n))*L, where d = (-1)^n, L = LCM{binomial(0,0), binomial(2,1),..., binomial(2n,n)}.at n=8A025542
• Numbers k such that k^2 + k - 1 and k^2 + k + 1 are twin primes and (k + 1)*(k + 1) + k + 1 - 1 and (k + 1)*(k + 1) + k + 1 + 1 are also twin primes.at n=29A088498