1,1

a(n) = u*sfk(u) = v*sfk(v)+1 for appropriate u, v.

9801 = 297*sfk(297) = 297*sfk(11*3^3) = 297*33 = A064549(297) = A064549(140)+1 = 140*sfk(140)+1 = 140*(7*5*2^2)+1 = 140*70+1 = 9800+1, therefore 9801 is a term.

Cf. A078310, A064549, A078315, A078325.

Sequence in context: A012141 A110553 A118893 this_sequence A055792 A053935 A086699

Adjacent sequences: A078323 A078324 A078325 this_sequence A078327 A078328 A078329

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 23 2002