it take me time to understand
what does regular expression do in this solution?
just for decrease solution size?
surface of a spherical planet
Longest run of consecutive numbers
Insert zeros into vector
Sum the 'edge' values of a matrix
Square a Number
Exponents in Factorials
Numbered lottery balls into cells
With apologies to William Blake
Fun with a compass
Pandigital Multiples of 11 (based on Project Euler 491)
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