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A353570 a(n) = 1 if A003963(A122111(n)) is equal to A003963(n), and 0 otherwise. 2

%I #8 Apr 30 2022 22:51:14

%S 1,1,0,0,0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,1,0,0,0,0,1,0,0,0,0,0,1,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1

%N a(n) = 1 if A003963(A122111(n)) is equal to A003963(n), and 0 otherwise.

%H Antti Karttunen, <a href="/A353570/b353570.txt">Table of n, a(n) for n = 1..65537</a>

%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>

%H <a href="/index/Pri#prime_indices">Index entries for sequences computed from indices in prime factorization</a>

%F a(n) = 1 if A003963(n) = A329382(n), otherwise 0.

%o (PARI)

%o A003963(n) = { n=factor(n); n[, 1]=apply(primepi, n[, 1]); factorback(n) }; \\ From A003963

%o A122111(n) = if(1==n,n,my(f=factor(n), es=Vecrev(f[,2]),is=concat(apply(primepi,Vecrev(f[,1])),[0]),pri=0,m=1); for(i=1, #es, pri += es[i]; m *= prime(pri)^(is[i]-is[1+i])); (m));

%o A353570(n) = (A003963(A122111(n))==A003963(n));

%Y Characteristic function of A325040.

%Y Cf. A003963, A122111, A329382.

%K nonn

%O 1

%A _Antti Karttunen_, Apr 29 2022

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Last modified July 24 15:22 EDT 2024. Contains 374584 sequences. (Running on oeis4.)