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A366888 Lexicographically earliest infinite sequence such that a(i) = a(j) => A366887(i) = A366887(j) for all i, j >= 0. 3
1, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 4, 3, 5, 1, 2, 2, 3, 2, 4, 3, 5, 2, 4, 4, 6, 3, 7, 5, 8, 1, 2, 2, 3, 2, 4, 3, 5, 2, 4, 4, 6, 3, 7, 5, 8, 2, 4, 4, 6, 4, 9, 6, 10, 3, 7, 7, 11, 5, 6, 8, 12, 1, 2, 2, 3, 2, 4, 3, 5, 2, 4, 4, 6, 3, 7, 5, 8, 2, 4, 4, 6, 4, 9, 6, 10, 3, 7, 7, 11, 5, 6, 8, 12, 2, 4, 4, 6, 4, 9, 6, 10, 4, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
COMMENTS
Restricted growth sequence transform of A366887.
LINKS
PROG
(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; };
A163511(n) = if(!n, 1, my(p=2, t=1); while(n>1, if(!(n%2), (t*=p), p=nextprime(1+p)); n >>= 1); (t*p));
A206787(n) = sumdiv(n, d, d*issquarefree(2*d));
v366888 = rgs_transform(vector(1+up_to, n, A366887(n-1)));
A366888(n) = v366888[1+n];
CROSSREFS
Cf. also A366881.
Sequence in context: A105102 A105105 A178677 * A243924 A335474 A333939
KEYWORD
nonn,look
AUTHOR
Antti Karttunen, Nov 04 2023
STATUS
approved

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Last modified May 28 04:02 EDT 2024. Contains 372900 sequences. (Running on oeis4.)