8583644160

Appears in sequences

• Numbers n such that sigma(n)/n = 9/2.at n=2A141645
• Numbers m with half-integral abundancy index, sigma(m)/m = k+1/2 with integer k.at n=10A159907
• Number of isomorphism classes of connected (D_4)-fold coverings of a connected graph with circuit rank n.at n=11A160873
• a(n) = ((2^b-1)/phi(n))*Sum_{d|n} Moebius(n/d)*d^(b-1) for b = 12.at n=3A161004
• Numbers n such that antisigma(n) mod n = 0, where antisigma(n) = A024816(n) = sum of numbers less than n which do not divide n.at n=11A242484
• Numbers k that divide 2*sigma(k).at n=28A246454
• Trajectory of 2 under the map x -> A274940(x).at n=24A274941