OFFSET
1,2
COMMENTS
Largest known term is a(278) = 8947091986560.
If it exists, a(279) > 10^16.
Is this sequence finite?
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..278
PROG
(PARI) { isA261342(n) = my(k, t1, t2); k=2; until(t2<=2, t1=floor(sqrtn(n+.5, k)); t2=ceil(sqrtn(n-.5, k)); if(n%t1 && n%t2, return(0)); k++); 1; }
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Max Alekseyev, Aug 15 2015
STATUS
approved