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

1,1

Comments

A068811 is a subset.

Links

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

Example

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

Mathematica

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

Crossrefs

Cf. A068811.

Sequence in context: A296233 A371185 A276112 * A309405 A354300 A032420

Adjacent sequences: A228072 A228073 A228074 * A228076 A228077 A228078

Keyword

nonn,base

Author

Jayanta Basu, Aug 09 2013

Status

approved