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A326201 Lexicographically earliest sequence such that for all i, j, a(i) = a(j) => f(i) = f(j), where f(n) = 0 if n > 1 and gcd(n,A000005(n)) = 1, with f(n) = n for all other numbers. 4
1, 2, 3, 3, 3, 4, 3, 5, 6, 7, 3, 8, 3, 9, 3, 3, 3, 10, 3, 11, 3, 12, 3, 13, 3, 14, 3, 15, 3, 16, 3, 17, 3, 18, 3, 19, 3, 20, 3, 21, 3, 22, 3, 23, 24, 25, 3, 26, 3, 27, 3, 28, 3, 29, 3, 30, 3, 31, 3, 32, 3, 33, 34, 3, 3, 35, 3, 36, 3, 37, 3, 38, 3, 39, 40, 41, 3, 42, 3, 43, 3, 44, 3, 45, 3, 46, 3, 47, 3, 48, 3, 49, 3, 50, 3, 51, 3, 52, 53, 3, 3, 54, 3, 55, 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) => A009191(i) = A009191(j) => A322980(i) = A322980(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; };

Aux326201(n) = if((n>1) && (1==gcd(n, numdiv(n))), 0, n);

v326201 = rgs_transform(vector(up_to, n, Aux326201(n)));

A326201(n) = v326201[n];

CROSSREFS

Cf. A000005, A009191, A046642, A305801, A322980.

Cf. also A326202, A326203.

Sequence in context: A322822 A305232 A322974 * A342625 A295569 A129574

Adjacent sequences:  A326198 A326199 A326200 * A326202 A326203 A326204

KEYWORD

nonn

AUTHOR

Antti Karttunen, Jul 11 2019

STATUS

approved

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Last modified May 23 08:38 EDT 2022. Contains 353961 sequences. (Running on oeis4.)