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Template:Sequence of the Day for July 14

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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).