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A001703
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Decimal concatenation of n, n+1, and n+2.
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2
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123, 234, 345, 456, 567, 678, 789, 8910, 91011, 101112, 111213, 121314, 131415, 141516, 151617, 161718, 171819, 181920, 192021, 202122, 212223, 222324, 232425, 242526, 252627, 262728, 272829, 282930, 293031, 303132, 313233, 323334, 333435, 343536, 353637
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The portion of the sequence with all three numbers having d digits - i.e., n in 10^(d-1)..10^d-3 - is in arithmetic sequence: a(n) = (10^(2*d)+10^d+1)*n + (10^d+2). - Franklin T. Adams-Watters, Oct 07 2011
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MATHEMATICA
| f[n_] := FromDigits@ Flatten@ IntegerDigits[{n, n + 1, n + 2}]; Array[f, 25] (* RGWv *)
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PROG
| (PARI) a(n)=eval(Str(n, n+1, n+2)) \\ Charles R Greathouse IV, Oct 08 2011
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CROSSREFS
| Cf. A074991.
Sequence in context: A179127 A153254 A193431 * A004945 A004965 A179612
Adjacent sequences: A001700 A001701 A001702 * A001704 A001705 A001706
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KEYWORD
| nonn,base
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AUTHOR
| mag(AT)laurel.salles.entpe.fr
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