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4, 20, 32, 45, 50, 68, 76, 92, 117, 124, 212, 236, 261, 325, 333, 338, 350, 412, 436, 452, 477, 578, 596, 608, 620, 628, 644, 650, 668, 716, 722, 740, 788, 801, 804, 825, 836, 855, 860, 884, 892, 916, 925, 932, 964, 968, 981, 1014, 1017, 1058, 1076
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refs;
listen;
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OFFSET
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1,1
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LINKS
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FORMULA
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{k: 2*tau(k) = 3*tau(k+1)}.
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MATHEMATICA
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Select[Range[1100], 2*DivisorSigma[0, #]==3*DivisorSigma[0, #+1]&] (* Harvey P. Dale, Nov 06 2012 *)
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PROG
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(PARI) is(n) = 2 * numdiv(n) == 3 * numdiv(n+1); \\ Amiram Eldar, Apr 09 2024
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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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