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A236433
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List of primes generated by factoring successive primary pseudoperfect numbers (A054377).
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5
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2, 2, 3, 2, 3, 7, 2, 3, 7, 43, 2, 3, 11, 23, 31, 2, 3, 11, 23, 31, 47059, 2, 3, 11, 17, 101, 149, 3109, 2, 3, 11, 23, 31, 47059, 2217342227, 1729101023519
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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It is unknown whether there are infinitely many primary pseudoperfect numbers or any odd ones.
See A054377 for other comments, references, links, etc.
For prime factors of Giuga numbers, see A236434; of terms in Sylvester's sequence, see A126263.
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LINKS
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EXAMPLE
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2 = 2.
6 = 2 * 3.
42 = 2 * 3 * 7.
1806 = 2 * 3 * 7 * 43.
47058 = 2 * 3 * 11 * 23 * 31.
2214502422 = 2 * 3 * 11 * 23 * 31 * 47059.
52495396602 = 2 * 3 * 11 * 17 * 101 * 149 * 3109.
8490421583559688410706771261086 = 2 * 3 * 11 * 23 * 31 * 47059 * 2217342227 * 1729101023519.
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MATHEMATICA
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A054377 = Cases[Import["https://oeis.org/A054377/b054377.txt", "Table"], {_, _}][[All, 2]];
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CROSSREFS
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KEYWORD
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nonn,more,hard
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AUTHOR
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STATUS
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approved
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