Template:Sequence of the Day for July 14

Intended for: July 14, 2012

Timetable

• First draft entered by Alonso del Arte on May 23, 2011 ✓
• Draft reviewed by May 14, 2012
• Draft approved by June 14, 2012

Yesterday's SOTD * Tomorrow's SOTD

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A106108: Rowland’s sequence:

a (1) = 7

, then

a (n) = a (n  −  1) + gcd (n, a (n  −  1)), n   >   1

.

{ 7, 8, 9, 10, 15, 18, 19, 20, 21, 22, 33, 36, 37, 38, ... }

The difference between two consecutive terms is a noncomposite number (either the unit 1, or a prime number).