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A329372 Dirichlet convolution of the identity function with A156552. 5

%I #9 Nov 12 2019 19:20:45

%S 0,1,2,5,4,12,8,17,12,22,16,44,32,40,32,49,64,61,128,78,56,76,256,132,

%T 32,142,50,136,512,152,1024,129,104,274,88,209,2048,532,188,230,4096,

%U 256,8192,252,148,1048,16384,356,80,159,356,454,32768,240,160,392,680,2078,65536,504,131072,4128,248,321,280,464,262144,858,1328,400

%N Dirichlet convolution of the identity function with A156552.

%C Equally, Dirichlet convolution of sigma (A000203) with A297112 (Möbius transform of A156552).

%H Antti Karttunen, <a href="/A329372/b329372.txt">Table of n, a(n) for n = 1..1024</a>

%H Antti Karttunen, <a href="/A329372/a329372.txt">Data supplement: n, a(n) computed for n = 1..16384</a>

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

%F a(n) = Sum_{d|n} d * A156552(n/d).

%F a(n) = Sum_{d|n} A000203(n/d) * A297112(d).

%F A000265(a(n)) = A329374(n).

%o (PARI)

%o A156552(n) = {my(f = factor(n), p2 = 1, res = 0); for(i = 1, #f~, p = 1 << (primepi(f[i, 1]) - 1); res += (p * p2 * (2^(f[i, 2]) - 1)); p2 <<= f[i, 2]); res}; \\ From A156552

%o A329372(n) = sumdiv(n,d,(n/d)*A156552(d));

%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 A329372(n) = sumdiv(n,d,sigma(n/d)*A297112(d));

%Y Cf. A000203, A061395, A156552, A297112, A297167, A329374.

%Y Cf. also A329371, A329373.

%K nonn

%O 1,3

%A _Antti Karttunen_, Nov 12 2019

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Last modified April 24 19:52 EDT 2024. Contains 371963 sequences. (Running on oeis4.)