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Jan 4, 2017 at 19:20 comment added user33097 I would actually characterize the numbers as "odd and not composite" since $1$ is neither prime nor composite.
Dec 6, 2016 at 8:31 comment added Manuel Hoffmann It's actually odd prime numbers, since 2 is also a prime number and it's not there.
Dec 5, 2016 at 23:10 history edited Peregrine Rook CC BY-SA 3.0
Improved formatting and explanation of letter sequence.
Dec 5, 2016 at 22:04 history answered Wu33o CC BY-SA 3.0