a(n) is the smallest number with exactly n divisors such that all its divisors end with the same digit (which is necessarily 1).

A338784

a(n) is the smallest number with exactly n divisors such that all its divisors end with the same digit (which is necessarily 1).

Terms

    a(0) =1a(1) =11a(2) =121a(3) =341a(4) =14641a(5) =3751a(6) =1771561a(7) =13981a(8) =116281a(9) =453871a(10) =25937424601a(11) =153791a(13) =54918391a(14) =14070001a(15) =852841a(17) =4767521a(19) =18608711a(20) =1702470121a(21) =804060162631a(23) =9381251a(24) =13521270961a(26) =195468361

External references