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A062503
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Squarefree numbers squared.
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3
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1, 4, 9, 25, 36, 49, 100, 121, 169, 196, 225, 289, 361, 441, 484, 529, 676, 841, 900, 961, 1089, 1156, 1225, 1369, 1444, 1521, 1681, 1764, 1849, 2116, 2209, 2601, 2809, 3025, 3249, 3364, 3481, 3721, 3844, 4225, 4356, 4489, 4761, 4900, 5041, 5329, 5476
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OFFSET
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1,2
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COMMENTS
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Also, except for the initial term, numbers whose prime factors are squared. - Cino Hilliard (hillcino368(AT)gmail.com), Jan 25 2006
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LINKS
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Harry J. Smith, Table of n, a(n) for n = 1..1000
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FORMULA
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n such that sumdiv(n, d, mu(d)*mu(n/d)) = 1 - Benoit Cloitre, Mar 03 2004
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MATHEMATICA
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Select[Range[100], SquareFreeQ]^2
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PROG
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(PARI) je=[]; for(n=1, 200, if(issquarefree(n), je=concat(je, n^2), )); je
(PARI) { n=0; for (m=1, 10^5, if(issquarefree(m), write("b062503.txt", n++, " ", m^2); if (n==1000, break)) ) } [From Harry J. Smith, Aug 08 2009]
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CROSSREFS
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Cf. A005117.
Sequence in context: A030140 A153158 A111245 * A063577 A087058 A046659
Adjacent sequences: A062500 A062501 A062502 * A062504 A062505 A062506
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 09 2001
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STATUS
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approved
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