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A320018
Restricted growth sequence transform of A320017.
2
1, 2, 2, 2, 2, 3, 2, 2, 2, 4, 2, 3, 2, 5, 6, 2, 2, 3, 2, 4, 7, 8, 2, 3, 2, 9, 2, 5, 2, 10, 2, 2, 11, 12, 13, 3, 2, 14, 15, 4, 2, 16, 2, 8, 6, 17, 2, 3, 2, 4, 18, 9, 2, 3, 19, 5, 20, 21, 2, 10, 2, 22, 7, 2, 23, 24, 2, 12, 25, 26, 2, 3, 2, 27, 6, 14, 28, 29, 2, 4, 2, 30, 2, 16, 31, 32, 33, 8, 2, 10, 34, 17, 35, 36, 37, 3, 2, 5, 11, 4, 2, 38, 2, 9, 39
OFFSET
1,2
COMMENTS
For all i, j: a(i) = a(j) => A318674(i) = A318674(j).
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; };
A019565(n) = {my(j, v); factorback(Mat(vector(if(n, #n=vecextract(binary(n), "-1..1")), j, [prime(j), n[j]])~))}; \\ From A019565
A320017(n) = if(1==n, n, my(m=1); fordiv(n, d, if(1==moebius(d), m *= A019565(d))); (m));
v320018 = rgs_transform(vector(up_to, n, A320017(n)));
A320018(n) = v320018[n];
CROSSREFS
Cf. A320017,
Cf. also A319682.
Sequence in context: A069719 A316990 A359212 * A327162 A326193 A327163
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 08 2018
STATUS
approved