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Search: id:A063774
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| A063774 |
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Number of divisors of n^2 is a square. |
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+0
1
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| 1, 6, 10, 14, 15, 16, 21, 22, 26, 33, 34, 35, 36, 38, 39, 46, 51, 55, 57, 58, 62, 65, 69, 74, 77, 81, 82, 85, 86, 87, 91, 93, 94, 95, 100, 106, 111, 115, 118, 119, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 177, 178, 183, 185, 187, 194
(list; graph; listen)
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OFFSET
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1,2
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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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EXAMPLE
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n=2: a(2) = 6 because the number of divisors of 6^2 is 9, a square.
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PROGRAM
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(PARI) j=[]; for(n=1, 500, a=numdiv(n^2); if(issquare(a), j=concat(j, n))); j
(PARI) { n=0; for (m=1, 10^9, if(issquare(numdiv(m^2)), write("b063774.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 30 2009]
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CROSSREFS
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Sequence in context: A087710 A163504 A129146 this_sequence A068993 A138592 A085232
Adjacent sequences: A063771 A063772 A063773 this_sequence A063775 A063776 A063777
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Aug 15 2001
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