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A327864
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Numbers whose arithmetic derivative is a multiple of 4, cf. A003415.
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17
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0, 1, 4, 8, 12, 15, 16, 20, 24, 28, 32, 35, 36, 39, 40, 44, 48, 51, 52, 55, 56, 60, 64, 68, 72, 76, 80, 81, 84, 87, 88, 91, 92, 95, 96, 100, 104, 108, 111, 112, 115, 116, 119, 120, 123, 124, 128, 132, 136, 140, 143, 144, 148, 152, 155, 156, 159, 160, 164, 168, 172, 176, 180, 183, 184, 187, 188, 189, 192, 196, 200, 203
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OFFSET
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1,3
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COMMENTS
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A multiplicative semigroup; if m and n are in the sequence then so is m*n. - Antti Karttunen, Feb 01 2023
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LINKS
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FORMULA
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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(isA327864(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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