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A322591 Lexicographically earliest such sequence a that for all i, j, a(i) = a(j) => f(i) = f(j), where f(n) = 0 for odd primes, and A007947(n) for any other number. 8
1, 2, 3, 2, 3, 4, 3, 2, 5, 6, 3, 4, 3, 7, 8, 2, 3, 4, 3, 6, 9, 10, 3, 4, 11, 12, 5, 7, 3, 13, 3, 2, 14, 15, 16, 4, 3, 17, 18, 6, 3, 19, 3, 10, 8, 20, 3, 4, 21, 6, 22, 12, 3, 4, 23, 7, 24, 25, 3, 13, 3, 26, 9, 2, 27, 28, 3, 15, 29, 30, 3, 4, 3, 31, 8, 17, 32, 33, 3, 6, 5, 34, 3, 19, 35, 36, 37, 10, 3, 13, 38, 20, 39, 40, 41, 4, 3, 7, 14, 6, 3, 42, 3, 12, 43 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For all i, j:

  a(i) = a(j) => A066086(i) = A066086(j),

  a(i) = a(j) => A322354(i) = A322354(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; };

A007947(n) = factorback(factorint(n)[, 1]);

Aux322591(n) = if((n>2)&&isprime(n), 0, A007947(n));

v322591 = rgs_transform(vector(up_to, n, Aux322591(n)));

A322591(n) = v322591[n];

CROSSREFS

Cf. A007947, A305801, A322587, A322588, A322589, A322590, A322592.

Sequence in context: A088748 A323235 A086374 * A332827 A325811 A324380

Adjacent sequences:  A322588 A322589 A322590 * A322592 A322593 A322594

KEYWORD

nonn

AUTHOR

Antti Karttunen, Dec 18 2018

STATUS

approved

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Last modified April 6 12:08 EDT 2020. Contains 333273 sequences. (Running on oeis4.)