Early Bird numbers

[Maximilian Hasler]

Definitely, I did too much administrative work this morning.
As the last line of my B-file shows, the comment is wrong.
Once again public apologies and Neil, please delete the 2nd line of the %C...
(9090 is a punctual bird.)
Maximilian

On 7/23/07, Maximilian Hasler <maximilian.hasler at gmail.com> wrote:
> Following Neil's suggestion to add the complement and his suggestion
> for naming it "punctual birds" :
>
> Subject: PRE-NUMBERED NEW SEQUENCE A131881 FROM Maximilian F. Hasler
>
> %I A131881
> %S A131881 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18,
> 19, 20, 22, 24, 25, 26, 27,
> 28, 29, 30, 33, 35, 36, 37, 38, 39, 40, 44, 46, 47, 48, 49, 50, 55,
> 57, 58, 59, 60,
> 66, 68, 69, 70, 77, 79, 80, 88, 90, 100, 102, 103, 104, 105, 106, 107,
> 108, 109, 113
> %N A131881 "punctual birds" - numbers which are not in A116700
> %C A131881 Numbers n that do not occur in the concatenation of 1,2,3...,n-1.
> There is no punctual bird larger than 9*10^k and smaller than
> 10^(k+1), for any integer k.
> %D A131881 Gardner, Martin. (November 2005). Transcendentals and early birds.
> Math Horizons XIII(2), pp 5, 34.
> %H A131881 <a href="http://www.itsoc.org/publications/nltr/it1202.pdf">Solomon
> W. Golomb, "EARLY BIRD NUMBERS", in IEEE Information TheorySociety
> Newsletter, Vol. 52, No. 4, December 2002</a>
> %H A131881 <a href="http://membership.kcatm.org/pub/summ2-06.pdf">R.
> Barger (editor), "Brain Teaser" in Volume 1, Issue 1 of KANSAS CITY
> AREA TEACHERS OF MATHEMATICS"</a>
> %e A131881 The first number not in this sequence is the early bird
> "12" which occurs as concatenation of 1 and 2.
> %o A131881 < ?php $s="."; for(; ++$i < 2000; $s .= $i )
> if(!strpos($s,"$i")) echo $i,", ";
> %Y A131881 Cf. A116700 (early birds)
> %O A131881 1
> %K A131881 ,base,easy,nonn,
> %A A131881 Maximilian F. Hasler (Maximilian.Hasler at gmail.com), Jul 23 2007