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From Wikipedia, the free encyclopedia

52 (fifty-two) is the natural number following 51 and preceding 53.

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Transcription

Contents

In mathematics

Fifty-two is the 6th Bell number[1] and a decagonal number.[2] It is an untouchable number, since it is never the sum of proper divisors of any number,[3] and it is a noncototient since it is never the answer to the equation x − φ(x).[4]

In science

Astronomy

In other fields

The piano has 52 white keys
The piano has 52 white keys

Fifty-two is:

Historical years

52 BC, AD 52, 1052, 1952, 2052, etc.

See also

B52 (disambiguation)

References

  1. ^ "Sloane's A000110 : Bell or exponential numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  2. ^ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ^ "Sloane's A005114 : Untouchable numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  4. ^ "Sloane's A005278 : Noncototients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
This page was last edited on 17 November 2018, at 12:20
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