A267193 Complement obverse of n.

9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 98, 88, 78, 68, 58, 48, 38, 28, 18, 8, 97, 87, 77, 67, 57, 47, 37, 27, 17, 7, 96, 86, 76, 66, 56, 46, 36, 26, 16, 6, 95, 85, 75, 65, 55, 45, 35, 25, 15, 5, 94, 84, 74, 64, 54, 44, 34, 24, 14, 4, 93, 83, 73, 63, 53, 43, 33, 23, 13

Offset: 0

Author

N. J. A. Sloane, Jan 24 2016

Keywords

• nonn
• base

Comments

Replace digits of n by their 9's complements, reverse the order, omit any leading zeros.

Suggested by a posting by Mike Stay to the Math Fun Mailing List, Jan 24 2016, which in turn was loosely based on the definition used in logic (see the Philosophy Pages link).

Examples

			The 9's complement of the digits of 980 are 019, so a(980) = 910.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..9999
• Garth Kemerling, Philosophy Pages: Immediate Inferences.

Crossrefs

Cf. A061601 (9's complement of n).

Programs

Maple

a:= n-> (s-> parse(cat(seq(9-s[i], i=1..nops(s))))
         )(convert(n, base, 10)):
seq(a(n), n=0..100);  # Alois P. Heinz, Jan 24 2016

Extensions

More terms from Alois P. Heinz, Jan 24 2016