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A319346
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Filter sequence combining the sum of proper divisors (A001065) with the 2-adic valuation of n (A007814).
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6
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1, 2, 3, 4, 3, 5, 3, 6, 7, 8, 3, 9, 3, 10, 11, 12, 3, 13, 3, 14, 15, 16, 3, 17, 18, 19, 20, 21, 3, 22, 3, 23, 24, 25, 20, 26, 3, 27, 28, 29, 3, 30, 3, 31, 32, 33, 3, 34, 35, 36, 37, 38, 3, 39, 28, 40, 41, 42, 3, 43, 3, 44, 45, 46, 47, 48, 3, 49, 50, 51, 3, 52, 3, 53, 54, 55, 47, 56, 3, 57, 58, 59, 3, 60, 41, 61, 32, 62, 3, 63, 37, 64, 65, 66, 67, 68, 3, 69
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OFFSET
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1,2
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COMMENTS
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Restricted growth sequence transform of ordered pair [A001065(n), A007814(n)].
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LINKS
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PROG
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(PARI)
up_to = 65537;
rgs_transform(invec) = { my(om = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(om, invec[i]), my(pp = mapget(om, invec[i])); outvec[i] = outvec[pp] , mapput(om, invec[i], i); outvec[i] = u; u++ )); outvec; };
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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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