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Giuga numbers
Composite numbers n such that each prime divisor p of n also divides n/p - 1. more

The Giuga numbers up to 1015 :

Distribution of the remainders when the numbers in this family are divided by n=2, 3,..., 11. (I took into account 7 values, from 30 to 432749205173838).

n\r 0  1 
270 2 
3700 3 
40070 4 
511230 5 
6700000 6 
73010111 7 
800400030 8 
9000700000 9 
101020001030 10 
1130010010200

A pictorial representation of the table above
motab
Imagine to divide the members of this family by a number n and compute the remainders. Should they be uniformly distributed, each remainder from 0 to n-1 would be obtained in about (1/n)-th of the cases. This outcome is represented by a white square. Reddish (resp. bluish) squares represent remainders which appear more (resp. less) frequently than 1/n.