A228075 Numbers n whose 10's complement is prime, i.e., 10^k-n, where k is the number of digits of n, is prime.

3, 5, 7, 8, 11, 17, 21, 27, 29, 33, 39, 41, 47, 53, 57, 59, 63, 69, 71, 77, 81, 83, 87, 89, 93, 95, 97, 98, 113, 117, 119, 123, 137, 141, 143, 147, 161, 171, 173, 177, 179, 189, 191, 203, 213, 227, 231, 239, 243, 249, 257, 261, 267, 273, 281, 291, 299

Offset: 1

Author

Jayanta Basu, Aug 09 2013

Keywords

• nonn
• base

Comments

A068811 is a subset.

Examples

			8 is a term since 10^1 - 8 = 2 is a prime.
Similarly, 39 is a term as 10^2 - 39 = 61 is prime.
		

Links

• Jayanta Basu, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A068811.

Programs

Mathematica

Select[Range[300], PrimeQ[10^(IntegerLength[#]) - #] &]