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A130817
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a(n) is the total sum of the digits of n-digit primes.
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11
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17, 197, 2041, 19879, 195226, 1920513, 18980518, 188098738, 1867197599, 18562452601, 184727304713, 1839816627645, 18335212785129, 182813489520604
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Table[Plus @@ Flatten[IntegerDigits[Select[Range[10^(n - 1), 10^n], PrimeQ[ # ] &]]], {n, 7}]
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PROG
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(PARI) A007953(n)={ local(a=0, shft=n) ; while(shft!=0, a += shft %10 ; shft \= 10 ; ) ; return(a) ; }
A130817(n)={ local(a=0) ; forprime(p=10^(n-1), 10^n, a += A007953(p) ; ) ; return(a) ; }
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CROSSREFS
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KEYWORD
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base,more,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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