OFFSET
1,2
COMMENTS
Sequence is probably complete. a(6), if it exists, is greater than 4 * 10^18. - Charles R Greathouse IV, May 14 2013
PROG
(PARI) is(n)=n==1 || nextprime(sqrtint((n^2+1)*(n^2-1)^2-1)+1) > sqrtint((n^2-1)*(n^2+1)^2-1) \\ Charles R Greathouse IV, May 14 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Gerasimov Sergey, May 11 2013
STATUS
approved