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A152294 Primes of the form : (p-n)/(n+1)=prime and (n+1)*p+n=prime. n=4. 3
29, 89, 419, 509, 659, 1259, 1289, 1319, 1949, 2099, 2309, 2339, 2609, 2939, 3989, 4049, 6089, 6599, 7559, 8609, 9239, 9539, 10709, 12659, 12899, 13469, 13499, 18119, 20399, 21089, 21269, 21419, 22469, 23369, 26669, 27539, 28559, 30059, 30449 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
This is the general form : (p-n)/(n+1)=primeand(n+1)*p+n=prime; 'Safe' primes and'Sophie Germain' primes just one part of this general form; If n=1 then we got'Safe' primes and'Sophie Germain' primes.
LINKS
MATHEMATICA
lst={}; n=4; Do[p=Prime[k]; If[PrimeQ[(p-n)/(n+1)]&&PrimeQ[(n+1)*p+n], AppendTo[lst, p]], {k, 7!}]; lst
CROSSREFS
Sequence in context: A141883 A142791 A325073 * A201487 A317537 A107940
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified June 12 20:44 EDT 2024. Contains 373360 sequences. (Running on oeis4.)