43441281domain: NAppears in sequencesPrimal codes of finite idempotent functions on positive integers.at n=24A109298Expansion of g.f. (1-4*x)/(1-13*x).at n=7A196663Integers m such that A240923(m) = 1, where A240923(n) = numerator(sigma(n)/n) - sigma(denominator(sigma(n)/n)).at n=32A240991