1,2

Also numbers that are square-free and 7-smooth: intersection of A005117 and A002473. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 15 2003

Sequence in context: A139826 A028722 A030050 this_sequence A059041 A129128 A164922

Adjacent sequences: A018333 A018334 A018335 this_sequence A018337 A018338 A018339

nonn,fini,full

N. J. A. Sloane (njas(AT)research.att.com).