32806

Appears in sequences

• Numbers that are the sum of 6 nonzero 8th powers.at n=25A003384
• a(n) is the least number m such that (m+n)!/m! = (m+1)*(m+2)*...*(m+n) divides lcm(1,...,m).at n=16A082093
• Inverse Moebius transform of the Mersenne numbers: a(n) = Sum_{d|n} (2^d - 1).at n=14A130887
• Wavelength (in ångströms) of the series limit of the Hydrogen spectrum for main quantum number n.at n=5A145646
• a(n) = 5*9^n + 1.at n=4A199563
• Expansion of G(1) where G(k) = 1 + q^k / ( 1 - q^k * G(k+2) ).at n=30A238434
• Number of solutions to +- 1^2 +- 3^2 +- 5^2 +- 7^2 +- ... +- (4*n-1)^2 = 0.at n=15A292496
• If the Collatz trajectory of n reaches 1, say after k steps, and there is an integer m > n such that T^i(m) and T^i(n) have the same parity for i = 0..k (where T^i denotes the i-th iterate of the Collatz map A006370), then a(n) is the least such m, otherwise a(n) is -1.at n=37A348094
• a(n) = Sum_{d|n} d^(n/d) * binomial(n/d-1,d-1).at n=20A376020