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A290082
Restricted growth sequence transform of A289625(A003961(n)).
2
1, 2, 3, 4, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 11, 14, 7, 15, 16, 17, 15, 11, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 23, 30, 31, 32, 33, 34, 20, 35, 36, 37, 30, 38, 39, 40, 41, 42, 19, 43, 44, 45, 37, 46, 47, 23, 48, 49, 50, 19, 51, 52, 43, 53, 54, 34, 55, 56, 57, 58, 59, 60, 61, 62, 30, 63, 64, 65, 66, 42, 67, 68, 34, 69, 30, 70, 71, 68, 72, 61
OFFSET
1,2
COMMENTS
For all i, j: a(i) = a(j) => A003972(i) = A003972(j).
LINKS
PROG
(PARI)
rgs_transform(invec) = { my(occurrences = Map(), outvec = vector(length(invec)), u=1); for(i=1, length(invec), if(mapisdefined(occurrences, invec[i]), my(pp = mapget(occurrences, invec[i])); outvec[i] = outvec[pp] , mapput(occurrences, invec[i], i); outvec[i] = u; u++ )); outvec; };
write_to_bfile(start_offset, vec, bfilename) = { for(n=1, length(vec), write(bfilename, (n+start_offset)-1, " ", vec[n])); }
A003961(n) = { my(f = factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; \\ This function from Michel Marcus
A289625(n) = { my(m=1, p=2, v=znstar(n)[2]); for(i=1, length(v), m *= p^v[i]; p = nextprime(p+1)); (m); };
write_to_bfile(1, rgs_transform(vector(16384, n, A289625(A003961(n)))), "b290082_upto16384.txt");
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jul 20 2017
STATUS
approved