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A052216
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Sum of two powers of 10.
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12
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2, 11, 20, 101, 110, 200, 1001, 1010, 1100, 2000, 10001, 10010, 10100, 11000, 20000, 100001, 100010, 100100, 101000, 110000, 200000, 1000001, 1000010, 1000100, 1001000, 1010000, 1100000, 2000000, 10000001, 10000010, 10000100, 10001000, 10010000, 10100000
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers n such that sum of digits is 2.
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FORMULA
| Sum of two powers of 10: a(n) = 10^n + 10^m, n >= 0, m = 0, ... n.
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MATHEMATICA
| t = 10^Range[0, 9]; Select[Union[Flatten[Table[i + j, {i, t}, {j, t}]]], # <= t[[-1]] + 1 &] (* T. D. Noe, Oct 09 2011 *)
With[{nn=7}, Sort[Join[Table[FromDigits[PadRight[{2}, n, 0]], {n, nn}], FromDigits/@Flatten[Table[Table[Insert[PadRight[{1}, n, 0], 1, i]], {n, nn}, {i, 2, n+1}], 1]]]] (* From Harvey P. Dale, Nov 15 2011 *)
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CROSSREFS
| Cf. A007953.
Sequence in context: A064975 A115095 A061907 * A094629 A081242 A071762
Adjacent sequences: A052213 A052214 A052215 * A052217 A052218 A052219
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KEYWORD
| easy,nonn,tabl
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AUTHOR
| Henry Bottomley (se16(AT)btinternet.com), Feb 01 2000
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