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A322310 a(n) = Product_{d|n, d+1 is prime} A008578(1+[Sum_{i=0..A286561(n,1+d)} A320000((n/d)/((1+d)^i), 1+d)]). Here A286561(n,k) gives the k-valuation of n (for k > 1). 5

%I #13 Dec 03 2018 18:29:36

%S 3,6,1,10,1,12,1,14,1,4,1,28,1,1,1,22,1,12,1,20,1,4,1,102,1,1,1,4,1,4,

%T 1,26,1,1,1,66,1,1,1,104,1,12,1,6,1,4,1,92,1,1,1,4,1,4,1,6,1,4,1,132,

%U 1,1,1,34,1,4,1,1,1,4,1,1240,1,1,1,1,1,4,1,57,1,4,1,21,1,1,1,28,1,1,1,6,1,1,1,492,1,1,1,12,1,4,1,6,1

%N a(n) = Product_{d|n, d+1 is prime} A008578(1+[Sum_{i=0..A286561(n,1+d)} A320000((n/d)/((1+d)^i), 1+d)]). Here A286561(n,k) gives the k-valuation of n (for k > 1).

%H Antti Karttunen, <a href="/A322310/b322310.txt">Table of n, a(n) for n = 1..16384</a>

%F a(n) = Product_{d|n} A008578(1+[Sum_{i=0..A286561(n,1+d)} A320000((n/d)/((1+d)^i), 1+d)])^A010051(1+d).

%F For all n, A056239(a(n)) = A014197(n).

%o (PARI)

%o A320000sq(n, k) = if(1==n, if(1==k,2,1), sumdiv(n, d, if(d>=k && isprime(d+1), my(p=d+1, q=n/d); sum(i=0, valuation(n, p), A320000sq(q/(p^i), p))))); \\ From A320000

%o A322310(n) = if(1==n,3,my(m=1); fordiv(n,d, my(s, p=d+1, q=n/d); if(isprime(p) && (s = sum(i=0,valuation(n, p), A320000sq(q/(p^i),p))), m *= prime(s))); (m));

%Y Cf. A014197, A320000, A322311 (rgs-transform).

%Y Cf. also A322312.

%K nonn

%O 1,1

%A _Antti Karttunen_, Dec 03 2018

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Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)