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A327863
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Numbers whose arithmetic derivative is a multiple of 3, cf. A003415.
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11
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0, 1, 8, 9, 14, 18, 20, 26, 27, 35, 36, 38, 44, 45, 50, 54, 62, 63, 64, 65, 68, 72, 74, 77, 81, 86, 90, 92, 95, 99, 108, 110, 112, 116, 117, 119, 122, 125, 126, 134, 135, 143, 144, 146, 153, 155, 158, 160, 161, 162, 164, 170, 171, 180, 185, 188, 189, 194, 196, 198, 203, 206, 207, 208, 209, 212, 215, 216, 218, 221, 225
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OFFSET
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1,3
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LINKS
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PROG
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(PARI)
A003415(n) = {my(fac); if(n<1, 0, fac=factor(n); sum(i=1, matsize(fac)[1], n*fac[i, 2]/fac[i, 1]))}; \\ From A003415
k=1; n=0; while(k<105, if(isA327863(n), print1(n, ", "); k++); 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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