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A063753
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Numbers k such that cototient(k) is a square and sets a new record for squares.
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2
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2, 6, 21, 24, 54, 96, 189, 216, 345, 384, 420, 796, 864, 1332, 1536, 1680, 2340, 3300, 3780, 5328, 6144, 6516, 6720, 8260, 8484, 9360, 10500, 13200, 14532, 15120, 18340, 19476, 20580, 24576, 26064, 26628, 26880, 29700, 33396, 33936, 34020
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n = 1..275
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PROG
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(PARI)a=0; for(n=1, 7000, x=n-eulerphi(n); if(issquare(x), b=x; if(b>a, a=b; print(n))))
(PARI) { n=0; a=0; for (m=1, 10^9, if (issquare(b=m - eulerphi(m)), if (b>a, a=b; write("b063753.txt", n++, " ", m); if (n==275, break))) ) } \\ Harry J. Smith, Aug 29 2009
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CROSSREFS
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Cf. A051953.
Sequence in context: A103160 A242819 A126099 * A066893 A004192 A104143
Adjacent sequences: A063750 A063751 A063752 * A063754 A063755 A063756
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls, Aug 11 2001
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EXTENSIONS
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More terms from Dean Hickerson, Aug 22 2001
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STATUS
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approved
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