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A063796
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phi(sigma(n^3)) is a square.
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1
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1, 3, 10, 14, 21, 49, 66, 70, 147, 160, 224, 248, 282, 330, 403, 462, 490, 764, 803, 817, 1034, 1056, 1120, 1235, 1508, 1512, 1584, 1752, 1779, 1792, 1852, 1974, 1976, 2076, 2310, 2418, 2573, 2821, 3232, 3234, 3401, 3416, 3551, 3565, 3684, 3763, 3820, 3991
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) j=[]; for(n=1, 10000, if(issquare(eulerphi(sigma(n^3))), j=concat(j, n))); j
(PARI) { n=0; for (m=1, 10^9, if(issquare(eulerphi(sigma(m^3))), write("b063796.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 31 2009]
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CROSSREFS
| Sequence in context: A190706 A146309 A085726 * A063221 A022409 A023866
Adjacent sequences: A063793 A063794 A063795 * A063797 A063798 A063799
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 19 2001
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