A228723 Smallest number not less than n with alternating parities of digits in decimal representation.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 12, 14, 14, 16, 16, 18, 18, 21, 21, 21, 23, 23, 25, 25, 27, 27, 29, 29, 30, 32, 32, 34, 34, 36, 36, 38, 38, 41, 41, 41, 43, 43, 45, 45, 47, 47, 49, 49, 50, 52, 52, 54, 54, 56, 56, 58, 58, 61, 61, 61, 63, 63, 65, 65, 67

Offset: 0

Author

Reinhard Zumkeller, Aug 31 2013

Keywords

• nonn
• base

Comments

A228722(n) <= n <= a(n) and A228710(a(n)) = 1;

a(A030141(n)) = A030141(n); a(A228709(n)) > A228709(n).

lim sup a(n)/n = 2080/1881. - Charles R Greathouse IV, Sep 12 2013

Examples

			a(100) = 101; a(1000) = 1010; a(10000) = 10101; a(100000) = 101010;
a(101) = 101; a(1001) = 1010.
		

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

Programs

Haskell

a228723 n = head [x | x <- [n..], a228710 x == 1]