OFFSET
1,1
COMMENTS
Under Schinzel's hypothesis H, this sequence is infinite. - Charles R Greathouse IV, Apr 23 2012
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
2^2+{1,3,7}= {5,7,11} all prime, 4^2+{1,3,7}= {17,19,23} all prime.
PROG
(PARI)
{ forstep ( n=2, 10^6, 2,
ns = n * n;
if ( ! isprime( ns+1 ), next() );
if ( ! isprime( ns+3 ), next() );
if ( ! isprime( ns+7 ), next() );
print1(n, ", ");
); }
/* Joerg Arndt, Apr 22 2012 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Apr 20 2012
STATUS
approved