smallest number with divisors = 1, 2, ..., n-1 mod n

[Andrew Weimholt]

%I A000001
%S A000001 1, 1, 2, 6, 8, 30, 12, 60, 96, 270, 90, 420, 72, 1638, 840,
1080, 300, 4410, 432, 5940, 3360, 6930, 540, 10920, 2880, 19890, 9360,
27300, 1680, 43890, 1200, 36720
%N A000001 a(n) is smallest number with divisors = 1, 2, ..., n-1  mod n
%e A000001 a(7)=12, 12's divisors are 1,2,3,4,6,12 and
      1 = 1 mod 7
      2 = 2 mod 7
      3 = 3 mod 7
      4 = 4 mod 7
     12 = 5 mod 7
      6 = 6 mod 7
%O A000001 1
%K A000001 ,nonn,
%A A000001 Andrew Weimholt (andrew at weimholt.com), Jul 04 2008

Andrew