235 (number)

← 234 235 236 →
← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred thirty-five
Ordinal	235th (two hundred and thirty-fifth)
Factorization	5 × 47
Roman numeral	CCXXXV
Binary	111010112
Ternary	222013
Quaternary	32234
Quinary	14205
Senary	10316
Octal	3538
Duodecimal	17712
Hexadecimal	EB16
Vigesimal	BF20
Base 36	6J36

235 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 (3223₄), 7 (454₇), 8 (353₈), 13 (151₁₃), 46 (55₄₆) and 234 (11₂₃₄)
• 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

• List of highways numbered 235

References

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