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octagonal numbers
A figurate number of form n(3n-2). more

The first 600 octagonal numbers :

Distribution of the remainders when the numbers in this family are divided by n=2, 3,..., 11. (I took into account 18257418 values, from 1 to 999999899565336).

n\r 0  1
291287099128709 2
3608580660858066085806 3
49128709912870900 4
573029667302968036514840 5
6304290330429033042903304290330429033042903 6
75216405521640626082020052164050 7
891287094564355000456435400 8
9202860220286022028602202860220286022028602202860220286022028602 9
103651483365148401825742036514833651484018257420 10
1133195303319531000331953001659765331953103319531

A pictorial representation of the table above
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.