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A107837 Leftmost digit of a(n) represents the number of even digits in a(n); rightmost digit of a(n) represents the number of odd digits in a(n). 0
20, 112, 132, 152, 172, 192, 201, 221, 241, 261, 281, 1013, 1033, 1053, 1073, 1093, 1103, 1123, 1143, 1163, 1183, 1213, 1233, 1253, 1273, 1293, 1303, 1323, 1343, 1363, 1383, 1413, 1433, 1453, 1473, 1493, 1503, 1523, 1543, 1563, 1583, 1613, 1633, 1653 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..44.

EXAMPLE

20 has two even digits ("2" and "0") and zero odd digit; 112 has one even digit ("2") and two odd digits ("1" and "1"), etc.

MATHEMATICA

okQ[n_]:=Module[{idn=IntegerDigits[n]}, First[idn]== Count[idn, _?EvenQ]&&Last[idn]==Count[idn, _?OddQ]]; Select[Range[2000], okQ]  (* Harvey P. Dale, Mar 13 2011 *)

CROSSREFS

Sequence in context: A024192 A228243 A086605 * A267843 A271494 A220928

Adjacent sequences:  A107834 A107835 A107836 * A107838 A107839 A107840

KEYWORD

base,easy,nonn

AUTHOR

Eric Angelini, Jun 12 2005

STATUS

approved

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Last modified August 21 13:32 EDT 2017. Contains 290890 sequences.