OFFSET
1,1
COMMENTS
Conjecture: The expression p*q + c with p and q consecutive primes and c = 30 generates more primes than any other value of c in the range 1 < c < 100 and p = 48611 which is 5000th prime. Hence, c = 30 is considered for this sequence.
LINKS
K. D. Bajpai, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1)=107: prime(4)*prime(5)+30=107, which is prime.
a(6)=929: prime(10)*prime(11)+30=929, which is prime.
MAPLE
KD:= proc() local a; a:= ithprime(n)*ithprime(n+1)+30; if isprime((a)) then RETURN((a)):fi; end: seq(KD(), n=1..500);
MATHEMATICA
Select[Table[Prime[n]*Prime[n+1]+30, {n, 100}], PrimeQ]
CROSSREFS
KEYWORD
nonn
AUTHOR
K. D. Bajpai, Sep 26 2013
STATUS
approved