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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A132132 "Early Bird" numbers n such that n-1 is not an Early Bird (cf. A116700). 4
 12, 21, 23, 31, 34, 41, 45, 51, 56, 61, 67, 71, 78, 81, 89, 91, 101, 110, 121, 131, 141, 151, 161, 171, 181, 191, 201, 210, 231, 241, 251, 261, 271, 281, 291, 301, 310, 341, 351, 361, 371, 381, 391, 401, 410, 451, 461, 471, 481, 491, 501, 510, 561, 571, 581 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Punctual Birds (A131881) are all numbers k with A132131(n) <= k < A132132(n) for some n Early Birds (A116700) are all numbers k with A132132(n) <= k < A132131(n+1) for some n LINKS Graeme McRae, Table of n, a(n) for n = 1..27348 EXAMPLE a(1)=12 because 12 is the first Early Bird. a(2)=21 because 21 is the second Early Bird. a(3)=23 because 23 is the third Early Bird. a(4)=31 because 31 is the fourth Early Bird. a(5)=34 because 31-32 are Early Birds and 33 is not an Early Bird. CROSSREFS Cf. A033307, A117804, A116700, A131881, A132131, A132133. Sequence in context: A089320 A227073 A116700 * A248378 A349649 A327297 Adjacent sequences:  A132129 A132130 A132131 * A132133 A132134 A132135 KEYWORD base,nonn AUTHOR Graeme McRae, Aug 11 2007 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 August 17 03:11 EDT 2022. Contains 356180 sequences. (Running on oeis4.)