44149domain: NAppears in sequencesMacMahon's generalized sum of divisors function.at n=27A002128Numbers k such that 275*2^k + 1 is prime.at n=27A053354a(n) = (2*n - 1)*(3*n^2 - 3*n + 2)/2.at n=24A063491a(n) = (2*n+1)*(2*n+3)*(2*n+5)/3.at n=24A162540