A091679 In base 4, numbers n not of the form k + reverse(k) for any k.

1, 3, 7, 8, 9, 11, 12, 13, 14, 16, 18, 19, 21, 22, 23, 24, 26, 27, 28, 29, 31, 32, 35, 36, 37, 38, 39, 40, 43, 44, 45, 46, 47, 48, 49, 52, 53, 54, 55, 56, 57, 60, 61, 62, 63, 64, 66, 69, 70, 71, 72, 73, 74, 77, 78, 79, 80, 81, 82, 83, 86, 87, 88, 89, 90, 91, 94, 95, 96, 97, 98

Offset: 0

Author

Klaus Brockhaus, Jan 28 2004

Keywords

• base
• easy
• nonn

Comments

Base-4 analog of A067031. Complement of A091678.

Examples

			31 is a term since 31 (decimal) = 133 and there is no k such that k + reverse(k) = 133 in base 4.
		

Crossrefs

Cf. A091678, A067031.