Mixed sums of squares and triangular numbers (III) |
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Authors: | Byeong-Kweon Oh Zhi-Wei Sun |
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Affiliation: | a Department of Applied Mathematics, Sejong University, Seoul 143-747, Republic of Korea b Department of Mathematics, Nanjing University, Nanjing 210093, People's Republic of China |
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Abstract: | In this paper we confirm a conjecture of Sun which states that each positive integer is a sum of a square, an odd square and a triangular number. Given any positive integer m, we show that p=2m+1 is a prime congruent to 3 modulo 4 if and only if Tm=m(m+1)/2 cannot be expressed as a sum of two odd squares and a triangular number, i.e., p2=x2+8(y2+z2) for no odd integers x,y,z. We also show that a positive integer cannot be written as a sum of an odd square and two triangular numbers if and only if it is of the form 2Tm(m>0) with 2m+1 having no prime divisor congruent to 3 modulo 4. |
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Keywords: | primary, 11E25 secondary, 05A05, 11D85, 11P99, 11Y11 |
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