235 (number)

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

← 234 235 236 →
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Cardinal	two hundred thirty-five
Ordinal	235th (two hundred thirty-fifth)
Factorization	5 × 47
Greek numeral	ΣΛΕ´
Roman numeral	CCXXXV
Binary	111010112
Ternary	222013
Octal	3538
Duodecimal	17712
Hexadecimal	EB16

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.
• a Smarandache–Wellin number

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
• 235 film, 35 mm film in daylight-loading spools
• Superscope 235, a motion picture film format
• 2.35 to 1 widescreen aspect ratio in anamorphic format

References

1. Sloane, N. J. A. (ed.). "Sequence A000566 (Heptagonal numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. Sloane, N. J. A. (ed.). "Sequence A005448 (Centered triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
3. Sloane, N. J. A. (ed.). "Sequence A000055 (Number of trees with n unlabeled nodes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
4. Sloane, N. J. A. (ed.). "Sequence A002717". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.