103912

Appears in sequences

• Numbers k such that 45*2^k - 1 is prime.at n=59A002242
• Expansion of Product_{k>0} (1 - 2*k*x^(2*k))/(1 + (2*k-1)*x^(2*k-1)).at n=37A319860
• a(n) is the length of the n-th row of A348575.at n=20A349547