# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a208259
Showing 1-1 of 1

%I A208259 #12 Jul 16 2014 15:38:41
%S A208259 1,11,101,111,121,131,141,151,161,171,181,191,1001,1011,1021,1031,
%T A208259 1041,1051,1061,1071,1081,1091,1101,1111,1121,1131,1141,1151,1161,
%U A208259 1171,1181,1191,1201,1211,1221,1231,1241,1251,1261,1271,1281,1291,1301,1311,1321,1331
%N A208259 Numbers starting and ending with digit 1.
%C A208259 Union of A062332 and A208260. Supersequence of A208262 (numbers with all divisors starting and ending with digit 1).
%C A208259 Intersection of A017281 and A131835; A000030(a(n)) = a(n) mod 10 = 1. - _Reinhard Zumkeller_, Jul 16 2014
%H A208259 Reinhard Zumkeller, <a href="/A208259/b208259.txt">Table of n, a(n) for n = 1..10000</a>
%t A208259 Select[Range[2000], First[IntegerDigits[#]] == 1 && Last[IntegerDigits[#]] == 1 &] (* _Vladimir Joseph Stephan Orlovsky_, Feb 26 2012 *)
%o A208259 (Haskell)
%o A208259 a208259 n = a208259_list !! (n-1)
%o A208259 a208259_list = 1 : map ((+ 1) . (* 10)) a131835_list
%o A208259 -- _Reinhard Zumkeller_, Jul 16 2014
%Y A208259 Cf. A062332 (primes starting and ending with a digit 1), A208260 (nonprime numbers starting and ending with a digit 1).
%Y A208259 Cf. A017281, A131835, A000030.
%K A208259 nonn,base
%O A208259 1,2
%A A208259 _Jaroslav Krizek_, Feb 24 2012

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE