Numbers m such that tau(m) = 2 * tau(m + 1) and simultaneously sigma(m) = 2 * sigma(m + 1), where tau(k) = A000005(k) and sigma(k) = A000203(k).

A353034

Numbers m such that tau(m) = 2 * tau(m + 1) and simultaneously sigma(m) = 2 * sigma(m + 1), where tau(k) = A000005(k) and sigma(k) = A000203(k).

Terms

    a(0) =20118a(1) =20712a(2) =79338a(3) =103410a(4) =203898a(5) =267630a(6) =570342a(7) =907710a(8) =1093026a(9) =1228062a(10) =1263918a(11) =1663752a(12) =2322760a(13) =3268782a(14) =3468486a(15) =3527250a(16) =5483418a(17) =6277038a(18) =6500442a(19) =7637980a(20) =9181578a(21) =9297078a(22) =17708178a(23) =18638646a(24) =25274946a(25) =25364526a(26) =25768302a(27) =25909254a(28) =31118664

External references