A303933 a(n) is the number of odd primitive abundant numbers with n distinct prime divisors.
0, 0, 8, 576, 3913172
Offset: 1
References
- Valdas Diciunas, On the number of odd primitive abundant numbers with five and six distinct prime factors, Vilnius Conference in Combinatorics and Number Theory, page 12, 2017.
Links
- Valdas Diciunas, On the number of odd primitive abundant numbers with five and six distinct prime factors, slides, 2017.
- L. E. Dickson, Finiteness of the odd perfect and primitive abundant numbers with n distinct prime factors, American Journal of Mathematics 35 (1913), pp. 413-422.
- Jacob Liddy, OPANS (Odd Primitive Abundant NumberS), 2018. The downloadable file is a Zip-archive, 640 Megabytes, uncompresses to 10 Gigabytes.
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