Smallest number m such that m(m+1)/2 is divisible by n.

Terms

a(0) =1a(1) =3a(2) =2a(3) =7a(4) =4a(5) =3a(6) =6a(7) =15a(8) =8a(9) =4a(10) =10a(11) =8a(12) =12a(13) =7a(14) =5a(15) =31a(16) =16a(17) =8a(18) =18a(19) =15a(20) =6a(21) =11a(22) =22a(23) =15a(24) =24a(25) =12a(26) =26a(27) =7a(28) =28a(29) =15