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Search: id:A113580
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| A113580 |
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Define prime(0) = 1; then a(n) = sum prime(d), where d ranges over the decimal digits of n. |
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+0
2
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| 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 3, 4, 5, 7, 9, 13, 15, 19, 21, 25, 4, 5, 6, 8, 10, 14, 16, 20, 22, 26, 6, 7, 8, 10, 12, 16, 18, 22, 24, 28, 8, 9, 10, 12, 14, 18, 20, 24, 26, 30, 12, 13, 14, 16, 18, 22, 24, 28, 30, 34, 14, 15, 16, 18, 20, 24, 26, 30, 32, 36, 18, 19, 20, 22, 24, 28
(list; graph; listen)
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OFFSET
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0,2
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EXAMPLE
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a(123) = prime(1) + prime(2) + prime(3) = 2 + 3 + 5 = 10.
a(10001) = 2 + 1 + 1 + 1 + 2 = 7.
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MATHEMATICA
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f[n_] := Plus @@ (IntegerDigits[n] /. {0 -> 1, 1 -> 2, 2 -> 3, 3 -> 5, 4 -> 7, 5 -> 11, 6 -> 13, 7 -> 17, 8 -> 19, 9 -> 23}); Table[ f[n], {n, 0, 75}] (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A113581; first occurrence in A113736.
Sequence in context: A113581 A124180 A151796 this_sequence A117322 A048380 A048382
Adjacent sequences: A113577 A113578 A113579 this_sequence A113581 A113582 A113583
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 06 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(at)rgwv.com), Nov 08 2005
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