Search: id:A127268
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%I A127268
%S A127268 0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,1,0,2,0,0,0,1,0,0,0,2,0,0,0,0,0,0,0,
%T A127268 3,0,0,0,6,0,0,0,2,6,0,0,4,0,6,0,2,0,4,0,6,0,0,0,2,0,0,6,0,0,0,0,2,0,0,
%U A127268 0,2,0,0,4,2,0,0,0,0,0,0,0,2,0,0,0,6,0,6,0,2,0,0,0,0,0,6,6,1
%N A127268 If the prime-factorization of n is n = product{p|n} p^b(p,n) (p = distinct 
               primes divisors of n, each b(p,n) is a positive integer), then a(n) 
               is (sum{p|n} p^b(p,n)) taken mod (sum{p|n} p).
%H A127268 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%F A127268 A008475(n) mod A008472(n), if n>1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Nov 01 2007
%e A127268 40 = 2^3 *5^1. So a(40) = 2^3 + 5^1 (mod (2+5)) = 13 (mod 7) = 6.
%p A127268 A008475 := proc(n) local ifs ; if n =1 then 0; else ifs := ifactors(n)[2] 
               ; add(op(1,i)^op(2,i),i =ifs) ; fi ; end: A008472 := proc(n) local 
               ifs ; if n =1 then 0; else ifs := ifactors(n)[2] ; add(op(1,i),i 
               =ifs) ; fi ; end: A127268 := proc(n) if n = 1 then 0 ; else A008475(n) 
               mod A008472(n) ; fi ; end: seq(A127268(n),n=1..100) ; - R. J. Mathar 
               (mathar(AT)strw.leidenuniv.nl), Nov 01 2007
%Y A127268 Sequence in context: A033772 A086015 A086012 this_sequence A083918 A083895 
               A093488
%Y A127268 Adjacent sequences: A127265 A127266 A127267 this_sequence A127269 A127270 
               A127271
%K A127268 nonn
%O A127268 1,12
%A A127268 Leroy Quet, Mar 27 2007
%E A127268 More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 01 2007

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