a(n) is the least k > 1 such that the factorial base expansion of k*n starts with that of n while the remaining digits are zeros.

A382177

a(n) is the least k > 1 such that the factorial base expansion of k*n starts with that of n while the remaining digits are zeros.

Terms

    a(0) =2a(1) =2a(2) =3a(3) =10a(4) =3a(5) =312a(6) =4a(7) =18a(8) =18a(9) =96a(10) =96a(11) =600a(12) =4a(13) =6168960a(14) =6120a(15) =18a(16) =18a(17) =11017036800a(18) =4a(20) =114a(21) =760a(22) =68947200a(23) =18a(24) =5a(25) =14544a(26) =141120a(27) =192a(28) =13320a(30) =28a(32) =27

External references