All the numbers given are the fibonacci numbers in increasing bases starting 2 !!!
Therefore,
11 = 3 base 2
12 = 5 base 3
20 = 8 base 4
23 = 13 base5 etc ...
So, the next number is 67 which is 55 base 8.
(Fibonacci series : 2, 3, 5, 8, 13, 21, 34, 55, 89..... where next number is sum of the previous to numbers.)
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