91 (عدد)

← 90 91 92 →
كميخطأ: الوظيفة "numeral_to_arabic" غير موجودة.
ترتيبي91st
(خطأ: الوظيفة "numeral_to_arabic" غير موجودة.)
التحليل لعوامل7 × 13
القواسم1, 7, 13, 91
العدد اليونانيϞΑ´
العدد الرومانيXCI
ثنائي10110112
ثلاثي101013
رباعي11234
خماسي3315
سداسي2316
ثماني1338
اثنا عشري7712
ستة عشري5B16
عشريني4B20
أساس 362J36

91 (ninety-one) is the natural number following 90 and preceding 92.

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In mathematics

ملف:Cube-sum-diff-91.png
91 as the sum and difference of two positive cubes

91 is:

The decimal equivalent of the fraction 191 can be obtained by using powers of 9.


In science

In other fields

Ninety-one is also:

References

  1. ^ Sloane, N. J. A. (ed.). "Sequence A001358". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ "Sloane's A000384 : Hexagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  3. ^ "Sloane's A003215 : Hex (or centered hexagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  4. ^ "Sloane's A060544 : Centered 9-gonal (also known as nonagonal or enneagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  5. ^ "Sloane's A005898 : Centered cube numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  6. ^ "Sloane's A000330 : Square pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  7. ^ Sloane, N. J. A. (ed.). "Sequence A047696 (Smallest positive number that can be written in n ways as a sum of two (not necessarily positive) cubes.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  8. ^ Friedman, Erich. What's Special About This Number? Archived 2018-02-23 at the Wayback Machine
  9. ^ "Sloane's A005043 : Riordan numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
  10. ^ "John Conway proves that 91 is the smallest number which looks prime but isn't". Ryan Andersen. 31 December 2020. Retrieved 2024-05-09.
  11. ^ "Prime Numbers". 9 May 2024.