Template:Sequence of the Day for August 6

Intended for: August 6, 2011

Timetable

• First draft entered by Alonso del Arte on May 31, 2011 as a verbatim copy of the write-up from December 6, 2010 ✓
• Draft reviewed by Alonso del Arte on July 28, 2011 ✓
• Draft approved by Daniel Forgues on August 7, 2011 ✓ (one day late...)

Yesterday's SOTD * Tomorrow's SOTD

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A061909: Base 10 skinny numbers.

{ 0, 1, 2, 3, 10, 11, 12, 13, ... }

When these numbers are squared using long multiplication, it is completely unnecessary to carry anything. For example,

 13
13
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 39
13
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169