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Template:Sequence of the Day for May 1

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Intended for: May 1, 2013

Timetable

  • First draft entered by Alonso del Arte on March 21, 2012
  • Draft reviewed by Daniel Forgues on April 26, 2012
  • Draft to be approved by April 1, 2012
Yesterday's SOTD * Tomorrow's SOTD

The line below marks the end of the <noinclude> ... </noinclude> section.



A057660:
n

k  = 1
n
gcd (n, k)
.
{ 1, 3, 7, 11, 21, 21, 43, 43, 61, 63, ... }
Alternatively, we can take the fractions
{ 
1
n
, ...,
n  −  1
n
, 1}
expressed in lowest terms, and add up the denominators. For example, for
n = 6
, we have
{ 
1
6
,
1
3
,
1
2
,
2
3
,
5
6
, 1}
, and 6 + 3 + 2 + 3 + 6 + 1 = 21.