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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A061471 First (leftmost) digit - second digit + third digit - fourth digit .... = 2. 1
 2, 20, 31, 42, 53, 64, 75, 86, 97, 101, 112, 123, 134, 145, 156, 167, 178, 189, 200, 211, 222, 233, 244, 255, 266, 277, 288, 299, 310, 321, 332, 343, 354, 365, 376, 387, 398, 420, 431, 442, 453, 464, 475, 486, 497, 530, 541, 552, 563, 574, 585, 596, 640, 651 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) == 9*(-1)^d (mod 11) if a(n) has d digits. - Robert Israel, Aug 05 2020 LINKS Robert Israel, Table of n, a(n) for n = 1..10000 MAPLE filter:= proc(n) local d, L, j;   L:= convert(n, base, 10);   d:= nops(L);   add(L[j]*(-1)^(d-j), j=1..d)=2 end proc: select(filter, [\$1..1000]); # Robert Israel, Aug 05 2020 MATHEMATICA okQ[n_] := With[{id = IntegerDigits[n]}, id.Array[2 Mod[#, 2] - 1&, Length[id]] == 2]; Select[Range[1000], okQ] (* Jean-François Alcover, Nov 17 2016 *) CROSSREFS Cf. A008593, A060978-A060980, A060982, A061470-A061479, A061870-A061882. Sequence in context: A059208 A268742 A261460 * A112271 A201122 A103076 Adjacent sequences:  A061468 A061469 A061470 * A061472 A061473 A061474 KEYWORD nonn,base,easy AUTHOR Amarnath Murthy, May 05 2001 EXTENSIONS More terms from Robert G. Wilson v, May 10 2001 and from Larry Reeves (larryr(AT)acm.org), May 14 2001 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 May 28 14:34 EDT 2022. Contains 354115 sequences. (Running on oeis4.)