Least k >= 1 such that sigma(k)/tau(k) has denominator n or zero if no k exists.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =450a(6) =64a(7) =128a(8) =36a(9) =162a(10) =1024a(11) =1800a(12) =4096a(13) =1458a(14) =144a(15) =32768a(16) =65536a(17) =54450a(18) =262144a(19) =405000a(20) =576a(21) =118098a(22) =4194304a(23) =28800a(24) =1296a(25) =1062882a(26) =900a(27) =5832a(28) =268435456a(29) =115200