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A329619 Difference between the maximal digit value used when A108951(n) is written in primorial base and its 2-adic valuation. 6

%I #13 Nov 18 2019 22:04:25

%S 1,0,0,0,0,0,0,-2,-1,0,0,1,0,0,4,-2,0,-1,0,1,4,0,0,-1,2,0,-2,1,0,2,0,

%T -4,4,0,6,0,0,0,4,-3,0,-2,0,1,2,0,0,-2,4,5,4,1,0,-2,2,4,4,0,0,-1,0,0,

%U 0,-4,11,9,0,1,4,2,0,-2,0,0,2,1,14,9,0,-3,2,0,0,-2,9,0,4,4,0,6,10,1,4,0,5,0,0,9,7,2,0,9,0,4,1

%N Difference between the maximal digit value used when A108951(n) is written in primorial base and its 2-adic valuation.

%H Antti Karttunen, <a href="/A329619/b329619.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>

%H <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>

%H <a href="/index/Pri#primorial_numbers">Index entries for sequences related to primorial numbers</a>

%F a(n) = A329344(n) - A001222(n).

%F a(n) = A328114(A108951(n)) - A007814(A108951(n)).

%F a(p) = 0 for all primes p.

%t With[{b = Reverse@ Prime@ Range@ 120}, Array[Max@ IntegerDigits[#, MixedRadix[b]] &@ Apply[Times, Map[#1^#2 & @@ # &, FactorInteger[#] /. {p_, e_} /; e > 0 :> {Times @@ Prime@ Range@ PrimePi@ p, e}]] - PrimeOmega[#] &, 105] ] (* _Michael De Vlieger_, Nov 18 2019 *)

%o (PARI)

%o A034386(n) = prod(i=1, primepi(n), prime(i));

%o A108951(n) = { my(f=factor(n)); prod(i=1, #f~, A034386(f[i, 1])^f[i, 2]) }; \\ From A108951

%o A328114(n) = { my(s=0, p=2); while(n, s = max(s,(n%p)); n = n\p; p = nextprime(1+p)); (s); };

%o A329344(n) = A328114(A108951(n));

%o A329619(n) = (A329344(n) - bigomega(n));

%Y Cf. A001222, A007814, A034386, A108951, A276086, A324886, A328114, A329344, A329618, A329620, A329622.

%K sign

%O 1,8

%A _Antti Karttunen_, Nov 18 2019

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Last modified June 30 10:41 EDT 2024. Contains 373866 sequences. (Running on oeis4.)