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A324120 Binary weight of SumXOR variant of A297168: a(n) = A000120(A324180(n)). 8

%I #12 Feb 19 2019 18:19:31

%S 0,0,0,1,0,2,0,2,1,2,0,2,0,2,2,3,0,2,0,2,2,2,0,2,1,2,2,2,0,2,0,4,2,2,

%T 2,3,0,2,2,4,0,2,0,2,2,2,0,2,1,2,2,2,0,2,2,4,2,2,0,4,0,2,2,5,2,2,0,2,

%U 2,2,0,2,0,2,2,2,2,2,0,4,3,2,0,4,2,2,2,4,0,2,2,2,2,2,2,2,0,2,2,3,0,2,0,4,2

%N Binary weight of SumXOR variant of A297168: a(n) = A000120(A324180(n)).

%H Antti Karttunen, <a href="/A324120/b324120.txt">Table of n, a(n) for n = 1..65537</a>

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

%F a(n) = A000120(A324180(n)).

%F a(n) <= A324190(n).

%F a(p^k) = k-1 for all primes p and exponents k >= 1.

%o (PARI)

%o A061395(n) = if(1==n, 0, primepi(vecmax(factor(n)[, 1])));

%o A297167(n) = if(1==n, 0, (A061395(n) + (bigomega(n)-omega(n)) - 1));

%o A297112(n) = if(1==n, 0, 2^A297167(n));

%o A324180(n) = { my(v=0); fordiv(n, d, if(d<n, v = bitxor(v,A297112(d)))); (v); };

%o A324120(n) = hammingweight(A324180(n));

%Y Cf. A000043, A324179, A324180, A324181, A324190, A324191, A324192, A324201.

%K nonn

%O 1,6

%A _Antti Karttunen_, Feb 19 2019

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)