A087324 Numbers n such that n and its 9's complement both have the same prime signature.

2, 7, 14, 22, 34, 65, 77, 85, 93, 97, 102, 105, 106, 114, 133, 134, 138, 161, 165, 205, 206, 214, 218, 221, 222, 234, 253, 254, 258, 262, 265, 275, 278, 301, 302, 305, 306, 314, 345, 354, 357, 365, 377, 413, 414, 437, 438, 445, 446, 454, 465, 466, 473, 475

Offset

1,1

Comments

Conjecture: (1) Sequence is infinite. (2) For every prime signature there corresponds a term in this sequence.

Links

Table of n, a(n) for n=1..54.

Example

34 is a member as 34= 2*17 and its 9's complement (99-34) = 65 = 13*5 both have the prime signature p*q.

Crossrefs

Cf. A087325.

Sequence in context: A114346 A369972 A325159 * A340664 A261246 A008865

Adjacent sequences: A087321 A087322 A087323 * A087325 A087326 A087327

Keyword

base,nonn

Author

Amarnath Murthy, Sep 04 2003

Extensions

Corrected and extended by David Wasserman, May 06 2005

Status

approved