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2, 3, 10, 12, 52, 188, 1175, 4840, 25168, 90992, 896368, 8164112, 30997008, 233151408, 2111839632
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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n = 5: a(5) = 52, sigma_2(52) = 2704+676+169+16+4+1 = 3570 = 2*3*5*7*17.
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PROG
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(PARI) { for (n=1, 100, m=1; while(omega(sigma(m, 2)) != n, m++); write("b066089.txt", n, " ", m) ) } \\ Harry J. Smith, Nov 12 2009
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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