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258 (two hundred [and] fifty-eight) is the natural number following 257 and preceding 259.
Natural number
In mathematics
258 is:
- a sphenic number[1]
- a nontotient[2]
- the sum of four consecutive prime numbers because 258 = 59 + 61 + 67 + 71
- 63 + 62 + 6
- an Ulam number[3]
References
- ^ "Sloane's A007304 : Sphenic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.
- ^ "Sloane's A005277 : Nontotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-20.
- ^ "Sloane's A002858 : Ulam numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.
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