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A334869
Lexicographically earliest infinite sequence such that a(i) = a(j) => f(i) = f(j) for all i, j >= 1, where f(1) = 0 and for n > 1, f(n) = A334870(n).
4
1, 2, 3, 3, 4, 5, 6, 7, 5, 8, 9, 10, 11, 12, 13, 7, 14, 15, 16, 17, 18, 19, 20, 21, 8, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 4, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 12, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 10, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 15, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 13, 92
OFFSET
1,2
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; };
A334870(n) = if(issquare(n), sqrtint(n), my(c=core(n), m=n); forprime(p=2, , if(!(c % p), m/=p; break, m*=p)); (m));
A334869aux(n) = if(1==n, 0, A334870(n));
v334869 = rgs_transform(vector(up_to, n, A334869aux(n)));
A334869(n) = v334869[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 08 2020
STATUS
approved