a(n) is the repeating digit pattern in penultimate digit of successive powers of n (omitting initial powers without at least two digits).

A253389

a(n) is the repeating digit pattern in penultimate digit of successive powers of n (omitting initial powers without at least two digits).

Terms

    a(2) =1652983470a(3) =2a(4) =31975a(5) =4400a(7) =8264462800a(8) =0a(9) =1234567890a(12) =9412305876a(13) =27a(14) =15937a(16) =2376a(17) =1652983470a(18) =0a(19) =24680a(22) =27a(23) =2a(24) =7a(27) =2488420660a(28) =0

External references