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A030133
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a(n+1) = sum of digits of (a(n) + a(n-1)).
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5
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2, 1, 3, 4, 7, 2, 9, 2, 2, 4, 6, 1, 7, 8, 6, 5, 2, 7, 9, 7, 7, 5, 3, 8, 2, 1, 3, 4, 7, 2, 9, 2, 2, 4, 6, 1, 7, 8, 6, 5, 2, 7, 9, 7, 7, 5, 3, 8, 2, 1, 3, 4, 7, 2, 9, 2, 2, 4, 6, 1, 7, 8, 6, 5, 2, 7, 9, 7, 7, 5, 3, 8, 2, 1, 3, 4, 7, 2, 9, 2, 2, 4, 6, 1, 7, 8, 6, 5, 2, 7, 9, 7, 7, 5, 3, 8, 2, 1, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| a(n) = A010888(A000032(n)). [Reinhard Zumkeller, Aug 20 2011]
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
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FORMULA
| a(n+24) = a(n); a(A017593(n)) = 9. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 04 2007
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MATHEMATICA
| Transpose[NestList[{Last[#], Total[IntegerDigits[Total[#]]]}&, {2, 1}, 100]] [[1]] (* From Harvey P. Dale, Jul 25 2011 *)
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PROG
| (Haskell)
a030133 n = a030133_list !! n
a030133_list =
2 : 1 : map a007953 (zipWith (+) a030133_list $ tail a030133_list)
-- Reinhard Zumkeller, Aug 20 2011
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CROSSREFS
| Cf. A030132, A007953, A049341.
Sequence in context: A098164 A158504 A060214 * A139374 A111958 A192439
Adjacent sequences: A030130 A030131 A030132 * A030134 A030135 A030136
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KEYWORD
| nonn,base,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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