254 (two hundred [and] fifty-four) is the natural number following 253 and preceding 255.
In mathematics
- It is a deficient number, since the sum of its divisors (excluding the same number) is 130 < 254.[1][better source needed]
- It is a semiprime number.[2][3][1] Moreover, in American English, its name has a semiprime number of syllables.[2]
- It is a square-free integer.[4]
- It is a nontotient.[5]
- It is a lazy caterer number.[6]
- It is a congruent number.[4]
References
- ^ a b "Is 254 a prime number?". www.numbers.education. Retrieved 2021-07-29.
- ^ a b "A230956 - OEIS". oeis.org. Retrieved 2021-07-29.
- ^ "254 (Number)". metanumbers.com. Retrieved 2021-07-29.
- ^ a b Alter, Ronald; Curtz, Thaddeus B. (1974). "A note on congruent numbers". Mathematics of Computation. 28 (125): 303–305. doi:10.1090/S0025-5718-1974-0337758-9. ISSN 0025-5718.
- ^ "A005277 - OEIS". oeis.org. Retrieved 2021-07-29.
- ^ "A000124 - OEIS". oeis.org. Retrieved 2021-07-29.