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Old 2020-04-25, 17:47   #353
sweety439
 
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Nov 2016

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Quote:
Originally Posted by sweety439 View Post
Smallest odd prime p such that (a^p-b^p)/(a-b) is (probable) prime for 2<=a<=50, -a<b<a, gcd(a,b) = 1

There are only 5 unknown (a,b): (32, -5), (43, 7), (44, -43), (46, 31), (50, -37)
The top 12 PRPs are: (only sorted by exponent)

(48^58543-47^58543)/(48-47)
(50^56099+43^56099)/(50+43)
(46^45281+11^45281)/(46+11)
(49^38069-46^38069)/(49-46)
(47^32833-33^32833)/(47-33)
(18^25667-1^25667)/(18-1)
(49^16747+46^16747)/(49+46)
(38^16747+7^16747)/(38+7)
(37^13217-34^13217)/(37-34)
(47^9181+37^9181)/(47+37)
(31^6961-6^6961)/(31-6)
(47^5641-23^5641)/(47-23)
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