Smallest multiple of n with property that digits are even and each digit is two less (mod 10) than the previous digit, if such a multiple exists; otherwise -1.

A062885

Smallest multiple of n with property that digits are even and each digit is two less (mod 10) than the previous digit, if such a multiple exists; otherwise -1.

Terms

    a(0) =0a(1) =2a(2) =2a(3) =6a(4) =4a(5) =20a(6) =6a(7) =42a(8) =8a(9) =864a(10) =20a(11) =42086a(12) =420a(13) =208a(14) =42a(15) =420a(16) =64a(17) =8642086a(18) =864a(19) =642086a(20) =20a(21) =42a(22) =42086a(23) =6420864a(24) =864a(25) =-1a(26) =208a(27) =864a(28) =420a(29) =8642

External references