Numbers n such that d(n)*reversal(n)=sigma(n), where d(n) is number of positive divisors of n.
A104907
Numbers n such that d(n)*reversal(n)=sigma(n), where d(n) is number of positive divisors of n.
Terms
- a(0) =1a(1) =73a(2) =861a(3) =7993a(4) =8241a(5) =799993a(6) =7999993a(7) =44908500a(8) =82000041a(9) =293884500a(10) =6279090751a(11) =8200000041a(12) =62698513951a(13) =79999999993a(14) =82000000041a(15) =374665576800a(16) =597921764310
External references
- oeis: A104907