Binomial-sum primality criterion for numbers of the form 4m plus or minus 1

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Let mm be a positive integer. The binomial-sum primality conjecture. If m≠30m\neq30 and

∑k=04m−2(2kk)mk≡4m−1(mod(4m−1)2),\sum_{k=0}^{4m-2}{2k\choose k}m^k\equiv4m-1\pmod{(4m-1)^2},

then 4m−14m-1 is prime. If

∑k=04m(2kk)(−m)k≡4m+1(mod(4m+1)2),\sum_{k=0}^{4m}{2k\choose k}(-m)^k\equiv4m+1\pmod{(4m+1)^2},

then 4m+14m+1 is prime. The authors report checking m≤1500m\leq1500 without finding counterexamples, while presenting this as a sufficient condition for primality.

References

Primary source

Victor J. W. Guo and Jiang Zeng, “Some congruences involving central q-binomial coefficients”, arXiv:0910.3563 (2010).

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