OFFSET
1,1
COMMENTS
Here 1 is treated as not squarefree. - Andrew Howroyd, Sep 19 2024
PROG
(PARI) isok(k)={if(issquarefree(k) && k>=100, my(b=10^logint(k, 10), m=k%b\10); m!=1 && issquarefree(m) && issquarefree(k\b*10+k%10), 0)} \\ Andrew Howroyd, Sep 19 2024
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 06 2002
EXTENSIONS
Offset changed and a(29) onwards from Andrew Howroyd, Sep 19 2024
STATUS
approved