100440domain: NAppears in sequencesLeast k such that k*(2^p-1)*(k*(2^p-1)+1)+1 is prime, where 2^p-1 runs through the Mersenne primes.at n=27A137909Fourier coefficients of the modular form (1/t_{6a}^3) * (1-12*sqrt(-3) / t_{6a})^(1/6) * F_{6a}^10.at n=30A341566