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Sum multiples of 3 and 5: Difference between revisions

Line 1,735:
sumdiv =: dyad : '(triangular <. x % y) * y'
 
echo 'For 10^20 - 1, the sum is ', ": +/ 99999999999999999999x(". (20#'9'),'x') sumdiv 3 5 _15
exit ''
 
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