[seqfan] Question

David Sycamore djsycamore at yahoo.co.uk
Mon Jun 3 15:05:54 CEST 2019

Dear Seqfans,

Consider the sequence:

“Odd square-free composite numbers divisible by the sum of their prime divisors” (subsequence of A046347, but not yet in oeis): 

105, 231, 627, 805, 897, 1581, 2967, 3055, 4543, 5487, 6461, 6745, 7881, 10707, 14231, 15015....

I have data up to 5*10^6.

Does anyone know if a Carmichael number could have this property? If so it should show up at some point in this sequence, but I found none so far. Any comment?



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