The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A132131 "Punctual Bird" numbers n with the additional property that n-1 is not a Punctual Bird (cf. A131881). 5
 1, 13, 22, 24, 33, 35, 44, 46, 55, 57, 66, 68, 77, 79, 88, 90, 100, 102, 113, 124, 133, 143, 153, 163, 173, 183, 193, 203, 224, 235, 244, 254, 264, 274, 284, 294, 304, 335, 346, 355, 365, 375, 385, 395, 405, 446, 457, 466, 476, 486, 496, 506, 557, 568, 577, 587 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 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)=1 because 1 is the first Punctual Bird. a(2)=13 because 1-11 are Punctual Birds and 12 is not a Punctual Bird. a(3)=22 because 13-20 are Punctual Birds and 21 is not a Punctual Bird. CROSSREFS Cf. A033307, A117804, A116700, A131881, A132132, A132133. Sequence in context: A056512 A158998 A122559 * A336263 A059408 A164455 Adjacent sequences:  A132128 A132129 A132130 * A132132 A132133 A132134 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)