Abstract
Building on the method used by Bhargava to prove “the fifteen theorem”, we show that every integer-valued positive definite quadratic form which represents all prime numbers must also represent 205. We further this result by proving that 205 is the smallest nontrivial composite number which must be represented by all such quadratic forms.
Citation
Justin DeBenedetto. "Quadratic forms representing all primes." Involve 7 (5) 619 - 626, 2014. https://doi.org/10.2140/involve.2014.7.619
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