This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A115305 a(n) = if n<5 then n else 5*a(floor(n/5)) + 4 - n mod 5. 9
 1, 2, 3, 4, 9, 8, 7, 6, 5, 14, 13, 12, 11, 10, 19, 18, 17, 16, 15, 24, 23, 22, 21, 20, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Self-inverse permutation of the natural numbers; A115310(n+3,4) = a(n); if n is written in base 5 representation, then a(n) is the value after replacing all digits d (but not the leading one) by 4-d. LINKS CROSSREFS Cf. A054429, A115303, A115304, A115306, A115307, A115308, A115309, A106649. Sequence in context: A060866 A064478 A111798 * A210747 A098550 A098293 Adjacent sequences:  A115302 A115303 A115304 * A115306 A115307 A115308 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Jan 20 2006 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .