# 235 (number)

| ||||
---|---|---|---|---|

Cardinal | two hundred thirty-five | |||

Ordinal |
235th (two hundred and thirty-fifth) | |||

Factorization | 5 × 47 | |||

Roman numeral | CCXXXV | |||

Binary |
11101011_{2} | |||

Ternary |
22201_{3} | |||

Quaternary |
3223_{4} | |||

Quinary |
1420_{5} | |||

Senary |
1031_{6} | |||

Octal |
353_{8} | |||

Duodecimal |
177_{12} | |||

Hexadecimal |
EB_{16} | |||

Vigesimal |
BF_{20} | |||

Base 36 |
6J_{36} |

**235** (**two hundred [and] thirty-five**) is the integer following 234 and preceding 236.

## In mathematics

**235** is:

- a semiprime.
- a heptagonal number.
^{[1]} - a centered triangular number.
^{[2]} - therefore a figurate number in two ways.
- palindromic in bases 4 (3223
_{4}), 7 (454_{7}), 8 (353_{8}), 13 (151_{13}), 46 (55_{46}) and 234 (11_{234}) - a Harshad number in bases 6, 47, 48, 95, 116, 189 and 231.

Also:

- There are 235 different trees with 11 unlabeled nodes.
^{[3]} - If an equilateral triangle is subdivided into smaller equilateral triangles whose side length is 1/9 as small, the resulting "matchstick arrangement" will have exactly 235 different equilateral triangles of varying sizes in it.
^{[4]}

## In science

- U-235 is the fissile isotope of uranium used in the first atomic bombs.

## See also

## References

- ↑ "Sloane's A000566 : Heptagonal numbers".
*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. - ↑ "Sloane's A005448 : Centered triangular numbers".
*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. - ↑ "Sloane's A000055 : Number of trees with n unlabeled nodes".
*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. - ↑ "Sloane's A002717".
*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation.

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