| ||||
|---|---|---|---|---|
| Cardinal | two hundred fifty-three | |||
| Ordinal | 253rd (two hundred fifty-third) | |||
| Factorization | 11 × 23 | |||
| Divisors | 1, 11, 23, 253 | |||
| Greek numeral | ΣΝΓ´ | |||
| Roman numeral | CCLIII | |||
| Binary | 111111012 | |||
| Ternary | 1001013 | |||
| Senary | 11016 | |||
| Octal | 3758 | |||
| Duodecimal | 19112 | |||
| Hexadecimal | FD16 | |||
253 (two hundred [and] fifty-three) is the natural number following 252 and preceding 254.
In mathematics
[edit]253 is:
- a semiprime since it is the product of 2 primes.
- a triangular number.[1]
- a star number.[2]
- a centered heptagonal number.[3]
- a centered nonagonal number.[4]
- a Blum integer.[5]
- a member of the 13-aliquot tree.
is a prime number. Its decimal expansion is 252 nines, an eight, and 253 more nines.
References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A000217 (triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A003154 (Centered 12-gonal numbers. Also star numbers: 6*n*(n-1) + 1)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A069099 (Centered heptagonal numbers. a(n) = (7*n^2 - 7*n + 2)/2)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A060544 (Centered 9-gonal numbers. (3n-1)*(3n-2)/2)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A016105 (Blum integers: numbers of the form p * q where p and q are distinct primes congruent to 3 (mod 4))". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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