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A289626 Restricted growth sequence transform of A289625, related to the structure of multiplicative group of integers modulo n. 15
1, 1, 2, 2, 3, 2, 4, 5, 4, 3, 6, 5, 7, 4, 8, 8, 9, 4, 10, 8, 11, 6, 12, 13, 14, 7, 10, 11, 15, 8, 16, 17, 18, 9, 19, 11, 20, 10, 19, 21, 22, 11, 23, 18, 19, 12, 24, 21, 23, 14, 25, 19, 26, 10, 27, 28, 29, 15, 30, 21, 31, 16, 32, 25, 33, 18, 34, 25, 35, 19, 36, 28, 37, 20, 27, 29, 38, 19, 39, 40, 41, 22, 42, 28, 43, 23, 44, 45, 46, 19, 47, 35, 38, 24, 48, 49 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..16384

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])); }

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(n))), "b289626_upto16384.txt");

CROSSREFS

Cf. A289625, A101296.

Cf. A000010, A002322, A034380, A046072, A289624 (some of the matching sequences).

Sequence in context: A305820 A272831 A290076 * A097004 A324343 A328474

Adjacent sequences:  A289623 A289624 A289625 * A289627 A289628 A289629

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jul 18 2017

STATUS

approved

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Last modified May 24 23:45 EDT 2020. Contains 334581 sequences. (Running on oeis4.)