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A304742
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Restricted growth sequence transform of A246277(A280866(n)).
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3
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1, 2, 3, 2, 4, 5, 2, 6, 7, 3, 2, 8, 9, 2, 10, 11, 4, 12, 13, 6, 14, 15, 2, 2, 16, 17, 7, 2, 18, 19, 2, 20, 21, 5, 3, 4, 22, 23, 2, 24, 25, 26, 2, 27, 28, 8, 10, 29, 30, 15, 31, 32, 3, 2, 33, 34, 11, 2, 35, 36, 2, 37, 38, 14, 2, 39, 40, 17, 16, 41, 42, 12, 4, 6, 8, 43, 44, 6, 45, 46, 10, 47, 48, 15, 49, 50, 2, 51, 52
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OFFSET
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1,2
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COMMENTS
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LINKS
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PROG
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(PARI)
A064989(n) = {my(f); f = factor(n); if((n>1 && f[1, 1]==2), f[1, 2] = 0); for (i=1, #f~, f[i, 1] = precprime(f[i, 1]-1)); factorback(f)};
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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