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Difference between revisions of "PrimeGrid Prime Sierpiński Problem"
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==Status== | ==Status== | ||
| − | As of | + | As of October 2020, there are 7 k-values being searched by the project: [[Proth prime 79309|79309]], [[Proth prime 79817|79817]], [[Proth prime 152267|152267]], [[Proth prime 156511|156511]], [[Proth prime 222113|222113]], [[Proth prime 225931|225931]], and [[Proth prime 237019|237019]]. The search is at n ≥ 22,600,000. ([https://www.primegrid.com/stats_psp_llr.php Live status]) |
There are also no known primes for k = [[Proth prime 22699|22699]] and [[Proth prime 67607|67607]], but these are already part of the standard Sierpiński problem. | There are also no known primes for k = [[Proth prime 22699|22699]] and [[Proth prime 67607|67607]], but these are already part of the standard Sierpiński problem. | ||
Revision as of 02:59, 4 October 2020
The Prime Sierpiński Problem is a PrimeGrid sub-project, launched in 2008. It is a continuation of the Prime Sierpinski Project that operated on the Mersenne Forums.
Purpose
The Sierpiński problem is attempting to prove that k = 78557 is the smallest Sierpiński number. However, 78557 itself is not a prime number.
The Prime Sierpiński Problem wants to find the smallest Sierpiński number that is also a prime number. The smallest known number that meets these conditions is k = 271129. To prove that 271129 is the smallest prime Sierpiński number, all prime values of k < 271129 must be shown to produce a prime number of the form k•2n+1.
Status
As of October 2020, there are 7 k-values being searched by the project: 79309, 79817, 152267, 156511, 222113, 225931, and 237019. The search is at n ≥ 22,600,000. (Live status)
There are also no known primes for k = 22699 and 67607, but these are already part of the standard Sierpiński problem.
History of eliminated candidates
- 2017-09-17: 168451•219375200+1
- 2016-10-31: 10223•231172165+1, eliminating k = 10223 from both the Sierpiński and Prime Sierpiński problems.
