75 (number)
| ||||
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Cardinal | seventy-five | |||
Ordinal |
75th (seventy-fifth) | |||
Factorization | 3 × 52 | |||
Divisors | 1, 3, 5, 15, 25, 75 | |||
Greek numeral | ΟΕ´ | |||
Roman numeral | LXXV | |||
Binary | 10010112 | |||
Ternary | 22103 | |||
Quaternary | 10234 | |||
Quinary | 3005 | |||
Senary | 2036 | |||
Octal | 1138 | |||
Duodecimal | 6312 | |||
Hexadecimal | 4B16 | |||
Vigesimal | 3F20 | |||
Base 36 | 2336 |
75 (seventy-five) is the natural number following 74 and preceding 76.
In mathematics
75 is:
- the fourth ordered Bell number, and counts the number of weak orderings on a set of four items.[1]
- the sum of the first five pentagonal numbers, and therefore a pentagonal pyramidal number.[2]
- an enneagonal number.[3]
- a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 7, 5, 12, 17, 29, 46, 75...[4]
- a self number because there is no integer that added up to its own digits adds up to 75.[5]
Excluding the infinite sets, there are 75 uniform polyhedra (or 76 if edges are allowed to coincide).
In other fields
Seventy-five is:
- The atomic number of rhenium
- The age limit for Canadian senators[6]
- A common name for the Canon de 75 modèle 1897, a French World War 1 gun
- The departement number of the city of Paris
- The number of balls in a standard game of Bingo in the United States
References
- ↑ Sloane, N.J.A. (ed.). "Sequence A000670". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Sloane, N.J.A. (ed.). "Sequence A002411". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Sloane, N.J.A. (ed.). "Sequence A001106". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Sloane, N.J.A. (ed.). "Sequence A007629". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ Sloane, N.J.A. (ed.). "Sequence A003052". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ↑ “Who are our senators and what do they do?”, Parliament of Canada, retrieved 2014-02-02.
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