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A326203 Lexicographically earliest sequence such that for all i, j, a(i) = a(j) => f(i) = f(j), where f(n) = 0 if n > 2 and gcd(n,phi(n)) = 1, with f(n) = n for all other numbers. 3
1, 2, 3, 4, 3, 5, 3, 6, 7, 8, 3, 9, 3, 10, 3, 11, 3, 12, 3, 13, 14, 15, 3, 16, 17, 18, 19, 20, 3, 21, 3, 22, 3, 23, 3, 24, 3, 25, 26, 27, 3, 28, 3, 29, 30, 31, 3, 32, 33, 34, 3, 35, 3, 36, 37, 38, 39, 40, 3, 41, 3, 42, 43, 44, 3, 45, 3, 46, 3, 47, 3, 48, 3, 49, 50, 51, 3, 52, 3, 53, 54, 55, 3, 56, 3, 57, 3, 58, 3, 59, 3, 60, 61, 62, 3, 63, 3, 64, 65, 66, 3, 67, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For all i, j:

  A305801(i) = A305801(j) => a(i) = a(j),

  a(i) = a(j) => A009195(i) = A009195(j) => A297086(i) = A297086(j),

  a(i) = a(j) => A000001(i) = A000001(j) => A297086(i) = A297086(j).

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

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; };

Aux326203(n) = if((n>2) && (1==gcd(n, eulerphi(n))), 0, n);

v326203 = rgs_transform(vector(up_to, n, Aux326203(n)));

A326203(n) = v326203[n];

CROSSREFS

Cf. A000001, A000010, A003277, A009195, A297086, A305801.

Cf. also A326201, A326202.

Sequence in context: A328470 A322810 A322024 * A305896 A322588 A323401

Adjacent sequences:  A326200 A326201 A326202 * A326204 A326205 A326206

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jul 11 2019

STATUS

approved

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Last modified November 18 04:44 EST 2019. Contains 329248 sequences. (Running on oeis4.)