A179085 Odd numbers having an odd sum of digits in their decimal representation.

1, 3, 5, 7, 9, 21, 23, 25, 27, 29, 41, 43, 45, 47, 49, 61, 63, 65, 67, 69, 81, 83, 85, 87, 89, 111, 113, 115, 117, 119, 131, 133, 135, 137, 139, 151, 153, 155, 157, 159, 171, 173, 175, 177, 179, 191, 193, 195, 197, 199, 201, 203, 205, 207, 209, 221, 223, 225, 227

Offset: 1

Author

Reinhard Zumkeller, Jun 28 2010

Keywords

• base
• nonn
• easy

Comments

a(n) = A030142(n) for n <= 25;

intersection of A005408 and A054684: A000035(a(n))*A179081(a(n))=1;

complement of A179084 with respect to A005408;

complement of A179083 with respect to A054684;

a(n) mod 2 = 1 and A007953(a(n)) mod 2 = 1.

Links

• R. Zumkeller, Table of n, a(n) for n = 1..1000
• Index entries for 10-automatic sequences.
• Index entries for Colombian or self numbers and related sequences

Programs

Mathematica

Select[Range[1,227,2], OddQ[Total[IntegerDigits[#]]] &] (* Jayanta Basu, May 07 2013 *)