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A052485
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Weak numbers (i.e., not powerful (1)): there is a prime p where p|n is true but p^2|n is not true.
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29
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2, 3, 5, 6, 7, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 82, 83, 84
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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Sum_{n>=1} 1/a(n)^s = zeta(s) - zeta(2*s)*zeta(3*s)/zeta(6*s), for s > 1. - Amiram Eldar, May 13 2023
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MATHEMATICA
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Select[Range[1000], Min[FactorInteger[#][[All, 2]]] <= 1 &] (* Geoffrey Critzer, Feb 11 2015 *)
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PROG
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(Haskell)
a052485 n = a052485_list !! (n-1)
a052485_list = filter ((== 0) . a112526) [1..]
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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