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A172126
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Members of A181666 of form 3k+1.
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1
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1, 4, 10, 16, 40, 64, 85, 160, 256, 340, 640, 682, 1024, 1360, 2560, 2728, 4096, 5440, 5461, 10240, 10912, 16384, 21760, 21844, 40960, 43648, 43690, 65536, 87040, 87376, 163840, 174592, 174760, 262144
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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Of form 2^m*(4^k-1)/3 and, simultaneously, of form 3l+1, for k>0, l,m>=0.
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LINKS
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PROG
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(PARI) for(n=1, 300000, o=3*n/2^valuation(n, 2)+1; b=ispower(o); if(b&&b%2==0&&round(sqrtn(o, b/2))==4&&(n-1)%3==0, print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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