Least k formed by the concatenation of two numbers n and d such that d is the n-th divisor of k, or 0 if no such k exists.
A257491
Least k formed by the concatenation of two numbers n and d such that d is the n-th divisor of k, or 0 if no such k exists.
Terms
- a(0) =11a(1) =22a(2) =0a(3) =410a(4) =5125a(5) =620a(6) =735a(7) =816a(8) =975a(9) =0a(10) =0a(11) =1280a(12) =0a(13) =14200a(14) =0a(15) =0a(16) =17200a(17) =1872a(18) =19250a(19) =2015625a(20) =21109375a(21) =222500a(22) =0a(23) =24150a(24) =251250a(25) =262000a(26) =0a(27) =0a(28) =291450a(29) =305000
External references
- oeis: A257491