Number x = concat(MSD(x),b) such that MSD(x)*b = phi(x), where MSD(x) is the Most Significant Digit of x and phi(x) is the Euler totient function of x.

A286130

Number x = concat(MSD(x),b) such that MSD(x)*b = phi(x), where MSD(x) is the Most Significant Digit of x and phi(x) is the Euler totient function of x.

Terms

    a(0) =24a(1) =26a(2) =87a(3) =250a(4) =440a(5) =448a(6) =644a(7) =875a(8) =1320a(9) =1640a(10) =1768a(11) =1996a(12) =2480a(13) =2500a(14) =2656a(15) =4400a(16) =6544a(17) =8250a(18) =8360a(19) =8420a(20) =8727a(21) =8875a(22) =13200a(23) =16400a(24) =19984a(25) =19996a(26) =24800a(27) =25000a(28) =25424a(29) =43750

External references