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Search: id:A104261
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| A104261 |
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Sum of even digits (0,2,4,6,8) of n-th prime. |
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+0
2
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| 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 4, 4, 4, 0, 0, 6, 6, 0, 0, 0, 8, 8, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 4, 0, 0, 6, 6, 0, 0, 8, 0, 0, 0, 0, 2, 4, 4, 4, 2, 2, 6, 2, 2, 8, 8, 2, 2, 10, 10, 2, 0, 0, 0, 0, 0, 0, 4, 4, 0, 0, 6, 0, 0, 8, 8, 0, 4, 4, 4, 6, 4, 4, 4, 8, 8, 4, 10, 10, 10, 4, 12, 4, 4, 0, 0, 2, 2, 4, 4, 0
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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A104261(n)=A007605(n)-A104260(n)
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MATHEMATICA
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sodev={}; Do[id=IntegerDigits[Prime[i]]; lid=Length[id]; sod=Sum[If[EvenQ[id[[k]]], id[[k]], 0], {k, lid}]; sodev={sodev, sod}, {i, 200}]; sodev//Flatten
f[n_] := Plus @@ Select[ IntegerDigits[ Prime[n]], EvenQ[ # ] && # > 1 &]; Table[ f[n], {n, 102}] (from Robert G. Wilson v (rgwv(at)rgwv.com), Nov 03 2005)
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CROSSREFS
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Sum of odd digits (1,3,5,7,9) of n-th prime: A104260, sum of prime digits (2,3,5,7) of n-th prime: A104250, sum of composite (nonprime) digits (1,4,6,8,9) of n-th prime: A104251, sum of digits of primes: A007605, primes: A000040.
Sequence in context: A091398 A062103 A112314 this_sequence A028702 A083929 A122698
Adjacent sequences: A104258 A104259 A104260 this_sequence A104262 A104263 A104264
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 26 2005
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