0
Anonymous
{4} is one example, {4, 13, 4, 16, 4} is another.
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40
There is an interval of 3 between the numbers 1+3=4 4+3=7 7+3=10 10+3=13 13+3=16 16+3=19 19+3=22 22+3=25
7
31
They are: 7, 10, 13, 16, and 19