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 A043061 (s(n)+4)/7, where s(n)=n-th base 7 palindrome that starts with 3. 0
 1, 4, 22, 23, 24, 25, 26, 27, 28, 148, 156, 164, 172, 180, 188, 196, 1030, 1037, 1044, 1051, 1058, 1065, 1072, 1080, 1087, 1094, 1101, 1108, 1115, 1122, 1130, 1137, 1144, 1151, 1158, 1165, 1172, 1180, 1187, 1194, 1201, 1208 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA b7p3Q[n_]:=Module[{idn7=IntegerDigits[n, 7]}, idn7[[1]]==3&&idn7 == Reverse[ idn7]]; (#+4)/7&/@Select[Range[10000], b7p3Q] (* Harvey P. Dale, Apr 27 2020 *) CROSSREFS Sequence in context: A121006 A268924 A185866 * A009925 A059653 A022385 Adjacent sequences:  A043058 A043059 A043060 * A043062 A043063 A043064 KEYWORD nonn,base AUTHOR STATUS approved

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Last modified May 24 18:33 EDT 2020. Contains 334580 sequences. (Running on oeis4.)