301140

Appears in sequences

• Numbers k such that the sets of prime factors (ignoring multiplicity) of A000203(k) = sigma(k) and of A001157(k) = sigma_2(k) are identical.at n=11A081380
• O.g.f. A(x) satisfies: [x^n] exp( n*(n+1)^2 * x ) / A(x)^(n+1) = 0 for n > 0.at n=4A337578