The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A156063 Odd composite numbers whose reversal is a different composite. 0
 15, 21, 25, 27, 39, 45, 49, 51, 57, 63, 65, 69, 75, 81, 85, 87, 93, 105, 115, 117, 123, 129, 135, 143, 147, 153, 155, 159, 165, 169, 177, 183, 185, 187, 189, 195, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 225, 231, 235, 237, 243, 245, 247, 249, 253, 255 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE If odd composite 15 < 51 = composite, then 15=a(1). If odd composite 21 > 12 = composite, then 21=a(2). If odd composite 25 < 52 = composite, then 25=a(3), etc. CROSSREFS Cf. A006567, A071904. Sequence in context: A177024 A325037 A154545 * A181780 A273061 A129926 Adjacent sequences: A156060 A156061 A156062 * A156064 A156065 A156066 KEYWORD nonn,base AUTHOR Juri-Stepan Gerasimov, Feb 03 2009 EXTENSIONS Added missing numbers in the 201-299 range. R. J. Mathar, Feb 13 2009 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified February 3 01:16 EST 2023. Contains 360024 sequences. (Running on oeis4.)