Cyclotomic(n, x)
returns the Cyclotomic polynomial
C_n(x).
See:
>> Cyclotomic(25,x)
1+x^5+x^10+x^15+x^20
The case of the 105-th cyclotomic polynomial is interesting because 105 is the lowest integer that is the product of three distinct odd prime numbers and this polynomial is the first one that has a coefficient other than 1, 0 or −1:
>> Cyclotomic(105, x)
1+x+x^2-x^5-x^6-2*x^7-x^8-x^9+x^12+x^13+x^14+x^15+x^16+x^17-x^20-x^22-x^24-x^26-x^28+x^31+x^32+x^33+x^34+x^35+x^36-x^39-x^40-2*x^41-x^42-x^43+x^46+x^47+x^48
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