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A063755
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Squares n which are divisible by phi(n).
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1
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1, 4, 16, 36, 64, 144, 256, 324, 576, 1024, 1296, 2304, 2916, 4096, 5184, 9216, 11664, 16384, 20736, 26244, 36864, 46656, 65536, 82944, 104976, 147456, 186624, 236196, 262144, 331776, 419904, 589824, 746496, 944784, 1048576, 1327104
(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,...,160
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MATHEMATICA
| Select[ Range[ 1, 2000 ], Mod[ #^2, EulerPhi[ #^2 ] ]==0& ]^2
Select[Range[2000]^2, Divisible[#, EulerPhi[#]]&]
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PROG
| (PARI) j=[]; for(n=1, 2000, if(Mod(n^2, eulerphi(n^2))==0, j=concat(j, n^2))); j
(PARI) { n=0; for (m=1, 10^9, s=m^2; if (s%eulerphi(s)==0, write("b063755.txt", n++, " ", s); if (n==160, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 29 2009]
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CROSSREFS
| Cf. A000010, A049237, A007694. Squares arising in A007694.
Sequence in context: A055808 A016742 A121317 * A166721 A085040 A030179
Adjacent sequences: A063752 A063753 A063754 * A063756 A063757 A063758
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KEYWORD
| nonn
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AUTHOR
| Jason Earls (zevi_35711(AT)yahoo.com), Aug 14 2001
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EXTENSIONS
| More terms from Dean Hickerson, Aug 15, 2001
Alternate Mathematica program provided by Harvey P. Dale, Dec. 11, 2010
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