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2021-06-08, 07:20
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#1 |
May 2013
Germany
5516 Posts |
10^n+7: four PRPs
I've found four probable primes in the range 200001 <= n <= 500000:
Code:
n = 221628, 350071, 371696, 487291. The attached file should "prove" this assertion. |
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2021-06-08, 09:33
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#2 | |
Jun 2003
5,051 Posts |
Quote:
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2021-06-08, 11:23
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#3 |
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May 2013
Germany
8510 Posts |
Any other in the specified range is meant.
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2021-06-08, 11:48
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#4 | |
Feb 2017
Nowhere
4,643 Posts |
Quote:
 I would have been tempted to answer "Yes."  I point out If the attached file was supposed to prove that 10^n + 7 is composite for all other n, it would have been big news if it actually did that. (Especially since 10^n + 7 is prime for n = 1, 2, 4, 8, and 9). A proof that 10^n + 7 is composite for all n greater than 5000000 would also be big news. |
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