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It should be prime numbers. It means a whole number greater than 1 whose only factors are 1 and itself.
I think [4, 8, 10, 14, 16, 20] is a better answer, it equals 72.
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The answer is in the description: "For comparing treat all letters as UpperCase."
Print the input.
On my machine too, the last test fails. Even I want to know the scenario in which it fails :(
[5, 7, 11, 13, 17, 19]does not satisfy the[p, p + 4, p + 6, p + 10, p + 12, p + 16]criteria. I think you've got the intervals switched, like[p, p + 2, p + 6, p + 8, p + 12, p + 16]