A088339 Numbers n such that n multiplied by (the 9's complement of n) + 1 is a prime. If n has d digits then 9's complement of n is 10^d -(n+1).

3, 6, 18, 24, 33, 36, 39, 60, 63, 66, 75, 81, 90, 105, 138, 144, 153, 168, 174, 195, 216, 231, 243, 270, 279, 300, 315, 330, 348, 354, 393, 396, 405, 438, 453, 456, 468, 474, 483, 498, 501, 516, 525, 531, 543, 546, 561, 594, 603, 606, 645, 651, 669, 684, 699

Offset

1,1

Comments

If n is a member then n == 0 (mod 3).

Links

Table of n, a(n) for n=1..55.

Example

39 *60 + 1 = 2341 is a prime.

Crossrefs

Sequence in context: A193433 A074370 A174101 * A064400 A352786 A117863

Adjacent sequences: A088336 A088337 A088338 * A088340 A088341 A088342

Keyword

base,nonn

Author

Amarnath Murthy, Oct 02 2003

Extensions

More terms from Ray Chandler, Oct 06 2003

Status

approved