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A323236
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Lexicographically earliest sequence such that a(i) = a(j) => f(i) = f(j), where f(1) = 0, f(n) = -1 if n is an even number > 2, and f(n) = A323234(n) for odd numbers >= 3.
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2
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1, 2, 3, 2, 4, 2, 5, 2, 4, 2, 6, 2, 7, 2, 8, 2, 4, 2, 6, 2, 9, 2, 10, 2, 11, 2, 12, 2, 13, 2, 14, 2, 4, 2, 6, 2, 9, 2, 10, 2, 15, 2, 16, 2, 17, 2, 18, 2, 19, 2, 20, 2, 21, 2, 22, 2, 23, 2, 24, 2, 25, 2, 26, 2, 4, 2, 6, 2, 9, 2, 10, 2, 15, 2, 16, 2, 17, 2, 18, 2, 27, 2, 28, 2, 29, 2, 30, 2, 31, 2, 32, 2, 33, 2, 34, 2, 35, 2, 36, 2, 37, 2, 38, 2, 39
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OFFSET
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1,2
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COMMENTS
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For all i, j:
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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; };
A053644(n) = { my(k=1); while(k<=n, k<<=1); (k>>1); }; \\ From A053644
A079944off0(n) = (1==binary(2+n)[2]);
A323236aux(n) = if(1==n, 0, if(!(n%2), -1, [A053645(n), A079944off0(n-2)]));
v323236 = rgs_transform(vector(up_to, n, A323236aux(n)));
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CROSSREFS
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Cf. also A323242 (somewhat analogous filter sequence for prime factorization).
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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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