a(n) = floor( exp(gamma) k log log k ) - sigma(k), where gamma is Euler's constant (A001620) and sigma(k) is sum of divisors of k (A000203), the n-th colossally abundant number (A004490).

A279702

a(n) = floor( exp(gamma) k log log k ) - sigma(k), where gamma is Euler's constant (A001620) and sigma(k) is sum of divisors of k (A000203), the n-th colossally abundant number (A004490).

Terms

    a(0) =-5a(1) =-6a(2) =-9a(3) =-18a(4) =-26a(5) =-34a(6) =-123a(7) =-107a(8) =3953a(9) =90021a(10) =203866a(11) =678250a(12) =3860926a(13) =62168609a(14) =1022130830a(15) =22777519100a(16) =46323907000

External references