Atom - Æ¿ - From Primorial Base
Tags: arithmetic , math , number , array , vectorize , prime , base
Arity: monadic
This atom is monadic, which means it takes one argument.
Functionality
Convert a number from primorial base.
Details
Starting from the right, each place value has a maximum allowed digit of 1, 2, 4, 6, 10, ..., Nth prime - 1. The place value of each digit is 1, 1×2, 1×2×3, 1×2×3×5, .... For example, if our digits are [2, 1, 1, 1], this is evaluated as 2×(1×2×3×5) + 1×(1×2×3) + 1×(1×2) + 1×(1) = 2×30 + 1×6 + 1×2 + 1×1 = 69, so 2,1,1,1 Æ¿ evaluates to 69.