| ||||
|---|---|---|---|---|
| Cardinal | two hundred seventeen | |||
| Ordinal | 217th (two hundred seventeenth) | |||
| Factorization | 7 × 31 | |||
| Greek numeral | ΣΙΖ´ | |||
| Roman numeral | CCXVII | |||
| Binary | 110110012 | |||
| Ternary | 220013 | |||
| Senary | 10016 | |||
| Octal | 3318 | |||
| Duodecimal | 16112 | |||
| Hexadecimal | D916 | |||
217 (two hundred [and] seventeen) is the natural number following 216 and preceding 218.
In mathematics[edit]
217 is a centered hexagonal number, a 12-gonal number, a centered 36-gonal number, a Fermat pseudoprime to base 5, and a Blum integer.[1] It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: . When written in binary, it is a non-repetitive Kaprekar number.[2] It is also the sum of all the divisors of 100.
See also[edit]
- 217, the year
References[edit]
- ^ The Number 217, Virtue Science
- ^ The non-repetitive Kaprekar binary numbers in decimal, OEIS
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction