

A343691


a(n) is the least prime p such that p + A014574(n) is prime.


1



3, 5, 5, 5, 7, 5, 7, 7, 5, 5, 11, 7, 11, 5, 13, 5, 11, 7, 11, 5, 5, 11, 7, 5, 19, 7, 7, 13, 5, 13, 11, 5, 11, 5, 5, 11, 7, 11, 7, 5, 11, 7, 5, 7, 5, 7, 5, 7, 5, 5, 5, 7, 29, 11, 11, 13, 5, 11, 17, 23, 5, 11, 5, 11, 17, 7, 11, 5, 5, 23, 7, 7, 7, 17, 5, 5, 7, 11, 7, 17, 29, 11, 17, 13, 5, 13, 7, 13
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OFFSET

1,1


COMMENTS

a(n) >= 5 for n >= 2, since A014574(n) == 0 (mod 6).


LINKS



EXAMPLE

a(5) = 7 because A014574(5) = 30 and 7 is the least prime p such that 30+p is prime.


MAPLE

P:= {seq(ithprime(i), i=1..10^4)}:
A014574:= sort(convert(map(`+`, P, 1) intersect map(``, P, 1), list)):
f:= proc(n) local p, t;
p:= 2;
do
p:= nextprime(p);
if isprime(p+A014574[n]) then return p fi
od
end proc:


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



