Template:Sequence of the Day for April 11

Intended for: April 11, 2013

Timetable

• First draft entered by Alonso del Arte on March 5, 2012 ✓
• Draft reviewed by Daniel Forgues on April 10, 2016 ✓
• Draft to be approved by March 11, 2013

Yesterday's SOTD * Tomorrow's SOTD

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A027427: Number of distinct products

i j

with

0   ≤   i   <   j   ≤   n

.

{ 1, 2, 4, 7, 11, 14, 20, 25, 32, ... }

So essentially we take multiplication tables, crop out any multiplicands greater than

n

, discard squares and duplicate results and then tally up the remaining results.