OFFSET
1,6
FORMULA
a(n) = prime(n)# / (A365021(n)-1).
Conjecture: a(n) < 2*prime(n).
PROG
(PARI) a(n) = my(P=vecprod(primes(n)), d=1); while(!ispseudoprime(floor((P/d)+1)) || gcd(P, d)<>d, d=d+2); d;
CROSSREFS
KEYWORD
nonn
AUTHOR
Alain Rocchelli, Aug 20 2023
STATUS
approved