131109

Appears in sequences

• Recip transform of 2*(1 + x^2 + x^4 + x^6)-1/(1-x).at n=16A049164
• Sums of three Mersenne primes.at n=39A174055
• a(n) = Sum_{d|n} 2^(sigma(d) - 1).at n=9A347991