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Template:Sequence of the Day for February 23

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Intended for: February 23, 2012

Timetable

  • First draft entered by Alonso del Arte on November 25, 2011 based on remarks by Henry Bottomley ✓
  • Draft reviewed by Daniel Forgues on February 22, 2016
  • Draft to be approved by January 23, 2012

Yesterday's SOTD * Tomorrow's SOTD

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A002322: Reduced totient function
ψ (n)
: least
k
such that
xk   ≡   1 (mod n)
for all
x
coprime to
n
.
{ 1, 1, 2, 2, 4, 2, 6, 2, 6, 4, 10, 2, 12, 6, 4, 4, 16, ... }
This is also the largest period of repeating digits of
1
n
written in different bases.