Honam Mathematical Journal (호남수학학술지)

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THE NUMBER OF POINTS ON ELLIPTIC CURVES E0a3:y2=x3+a3 OVER Fp MOD 24

  • Received : 2009.07.13
  • Accepted : 2009.08.21
  • Published : 2009.09.25
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Abstract

In this paper, we calculate the number of points on elliptic curves $E^{a^3}_0:y^2=x^3+a^3$ over ${\mathbb{F}}_p$ mod 24 and $E^b_0:y^2=x^3+b$ over ${\mathbb{F}}_p$ mod 6, where b is cubic non-residue in ${\mathbb{F}}^*_p$. For example, if p ${\equiv}$ 1 (mod 12) is a prime, and a and a(2t - 3) are quadratic residues modulo p with $3t^2{\equiv}1$ (mod p), then the number of points in $E^{a^3}_0:y^2=x^3+a^3$ is congruent to 0 modulo 24.

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References

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