[seqfan] Is this right? smallest prime factor of smaller of amicable pair

Jonathan Post jvospost3 at gmail.com
Mon Aug 16 08:14:17 CEST 2010


2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 3, 2, 2
smallest prime factor of smaller of amicable pair
a(n) = A020639(A002025(n)) =   Lpf(A002025(n)) = sigma(A002025(n))-A002025(n).
Must always be 2 or 3?




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