This site is supported by donations to The OEIS Foundation.

Template:Sequence of the Day for February 15

From OeisWiki
Jump to: navigation, search


Intended for: February 15, 2012

Timetable

  • First draft entered by Alonso del Arte on November 13, 2011 based on a remark from Jonathan Vos Post ✓
  • Draft to be reviewed by December 15, 2011
  • Draft to be approved by January 15, 2012

Yesterday's SOTD * Tomorrow's SOTD

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



A002997: Carmichael numbers.

{ 561, 1105, 1729, 2465, 2821, 6601, 8911, ... }
Ghatage and Scott prove using Fermat's little theorem that
(a + b)n   ≡   an + bn  (mod n)
(the freshman’s dream) exactly when
n
is a prime or a Carmichael number.