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!)
 A290393 Numbers that are not the difference of two binary palindromes (A006995). 2
 1844, 1892, 2512, 3700, 4702, 5476, 5534, 7364, 7784, 7876, 8068, 8080, 8440, 8596, 8632, 8764, 9100, 9308, 9334, 9404, 10000, 10108, 10120, 10348, 10456, 10480, 10744, 10844, 11024, 11504, 11588, 12604, 12722, 13714, 14576, 15812, 16150, 16622, 17300, 17820, 17950, 18316, 18622, 21100, 21400, 21860 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Not currently known to be an infinite sequence. Based on b-file of Giovanni Resta, the smallest value of a(n) such that a(n+1) - a(n) = 2 is 76156. - Altug Alkan, Aug 08 2017 LINKS Giovanni Resta, Table of n, a(n) for n = 1..342 (terms <= 10^5) MATHEMATICA g[w_] := FromDigits[Join @@ w, 2]; bp[1] = {1}; bp[n_] := Block[{b, r, h = Floor[n/2]}, Sort@ Flatten@ Table[b = IntegerDigits[k, 2, h]; r = Reverse@b; If[OddQ@n, g /@ {{b, {0}, r}, {b, {1}, r}}, g@{b, r}], {k, 2^h/2, 2^h - 1}]]; pp = Sort@Flatten[Table[bp[h], {h, 32}]]; T = Range[50000] * 0; i = 0; While[i < Length[pp] - 1, i++; j = i+1; While[j <= Length[pp] && (d = pp[[j]] - pp[[i]]) <= 10^5, T[[d/2]] = 1; j++]]; 2 Flatten[Position[T, 0]] (* Giovanni Resta, Aug 08 2017 *) CROSSREFS Cf. A006995. Sequence in context: A252214 A112017 A297894 * A251109 A236160 A209966 Adjacent sequences:  A290390 A290391 A290392 * A290394 A290395 A290396 KEYWORD nonn,base AUTHOR Jeffrey Shallit, Jul 29 2017 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 1 04:32 EST 2021. Contains 349426 sequences. (Running on oeis4.)