| ||||
|---|---|---|---|---|
| Cardinal | two hundred ninety-one | |||
| Ordinal | 291st (two hundred ninety-first) | |||
| Factorization | 3 × 97 | |||
| Divisors | 1, 3, 97, 291 | |||
| Greek numeral | ΣϞΑ´ | |||
| Roman numeral | CCXCI | |||
| Binary | 1001000112 | |||
| Ternary | 1012103 | |||
| Senary | 12036 | |||
| Octal | 4438 | |||
| Duodecimal | 20312 | |||
| Hexadecimal | 12316 | |||
291 is the natural number following 290 and preceding 292.
In mathematics
[edit]- 291 is an odd composite number with two prime factors.[1]
- 291 is a semiprime number meaning that it has 2 prime factors.[2]
- 291 can be written as the sum of the nth prime plus n. It is the 52nd prime (239) plus 52.[3]
- 291 is one of the positions of “c” in the tribonacci word abacabaab… defined by a->ab, b->ac, c->a.[4]
- 291 is the sum of 6 different 4th powers. It is the sum of 44+24+24+14+14+14.[5]
World Records
[edit]- On March 6, 2022, Tamara Walcott received the Guinness World Record for the elephant bar deadlift achieved by a woman. She lifted a weight of 291 kg.[6]
- On December 19, 2021, the greatest number of cakes eaten online simultaneously was achieved in Tanba, Japan. There were 291 cakes.[7]
- On October 25, 2014, the longest string instrument was created in Singapore. It was the ‘Earth Harp’ at a length of 291 m.[8]
- On August 7, 2011, Fred Grsybowski achieved the Guinness World Record for the tallest usable pogo stick in Toronto. It was 2.91 m tall.[9]
Other fields
[edit]- The calendar years 291 AD and 291 BC.
- 291 is the number for several highways across the countries of Canada, Japan, and the United States.
- 291 Alice is an asteroid in the asteroid belt. It was discovered by Johann Palisa in Vienna, Austria.[10]
References
[edit]- ^ "Facts about the integer". mathworld.wolfram.com.
- ^ "Semiprime". mathworld.wolfram.com.
- ^ Sloane, N. J. A. (ed.). "Sequence A014688". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A003146 (Positions of letter c in the tribonacci word abacabaabacababac... generated by a->ab, b->ac, c->a (cf. A092782))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A003340 (Numbers that are the sum of 6 positive 4th powers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ "291 kg elephant bar deadlift". www/guinnessworldrecords.com.
- ^ "291 cakes eaten online". www.guinnessworldrecords.com.
- ^ "291 m long string instrument". www.guinnessworldrecords.com.
- ^ "2.91 m tall usable pogo stick". www.guinnessworldrecords.com.
- ^ "291 Alice". www.universguide.com. 27 March 2019.
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