A376545 Least prime factor of A252043(n) for n > 1 with a(1) = 1.
1, 2, 3, 2, 3, 2, 127, 2, 3, 1234567891, 2, 9091, 3, 12345678910111, 2, 17, 113, 7, 2, 19, 3, 7, 2, 123456789101112131415161, 3, 13, 2, 17, 13, 2, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 5, 2, 2, 2, 3, 2, 2, 2, 3, 3, 2, 3, 29, 547, 2, 3, 3, 3, 2, 31, 3, 3, 2, 3, 71, 7
Offset: 1
Examples
A252043(3) = 123 = 3 * 41, so a(3) = 3.
Links
- Micha Fleuren, Smarandache Factors and Reverse Factors.
Programs
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PARI
a(n) = my(list=List(), k=1); while(#list