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Full Version: (50G) Characteristic Function of OEIS A053432
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lists the numbers having digits read left to right in alphabetic order in English reading 0 as "zero".

The programme below for integer input returns a 1. if the number is in the sequence A053432, 0. otherwise.

I doubt the programme can be improved & would be pleased to be proven wrong.

Alternative algorithms welcome.


  # FF
    FPTR2 ^Z>S
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