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A277878 Smallest prime q with q > r such that p = (q + r + 1)/r, where p = prime(n) and r = A277879(n). 1

%I #17 Jul 26 2021 04:49:38

%S 3,7,11,19,23,31,53,43,83,59,71,79,83,137,103,173,179,131,139,359,233,

%T 163,263,191,199,509,211,1187,223,251,389,271,2621,443,449,311,809,

%U 331,859,4093,359,379,383,587,593,419,443,677,683,463,2617,479,499,1279

%N Smallest prime q with q > r such that p = (q + r + 1)/r, where p = prime(n) and r = A277879(n).

%C Rassias's conjecture is the claim that q and r exist for every p.

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Rassias%27_conjecture">Rassias' conjecture</a>.

%o (PARI) a(n) = my(t=prime(n)-1); forprime(r=2, oo, if(isprime(r*t-1), return(r*t-1))); \\ _Jinyuan Wang_, Jul 25 2021

%Y Cf. A277879.

%K nonn

%O 2,1

%A _Felix Fröhlich_, Nov 03 2016

%E Terms corrected by and more terms from _Jinyuan Wang_, Jul 25 2021

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Last modified April 17 22:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)