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A338566 Primes p such that (p*q) mod r is prime, where q and r are the next primes after p. 3
5, 11, 19, 29, 43, 47, 283 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(8) > 40000000 if it exists.
LINKS
EXAMPLE
a(3)=19 is in the sequence because it is prime, the next two primes are 23 and 29, and (19*23) mod 29 = 2, which is prime.
MAPLE
R:= NULL: q:= 2: r:= 3:
count:= 0:
for i from 1 to 10000 do
p:= q; q:= r; r:= nextprime(r);
if isprime(p*q mod r) then count:= count+1; R:= R, p fi
od:
R;
CROSSREFS
Contained in A338578.
Cf. A338567.
Sequence in context: A002327 A078179 A045451 * A352795 A368898 A326665
KEYWORD
nonn,more
AUTHOR
J. M. Bergot and Robert Israel, Nov 02 2020
STATUS
approved

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Last modified March 28 16:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)