A043074 - OEIS

A043074

a(n)=(s(n)+6)/9, where s(n)=n-th base 9 palindrome that starts with 3.

1, 4, 28, 29, 30, 31, 32, 33, 34, 35, 36, 244, 254, 264, 274, 284, 294, 304, 314, 324, 2188, 2197, 2206, 2215, 2224, 2233, 2242, 2251, 2260, 2270, 2279, 2288, 2297, 2306, 2315, 2324, 2333, 2342, 2352, 2361, 2370, 2379, 2388, 2397

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..44.

MATHEMATICA

b9pQ[n_]:=Module[{idn9=IntegerDigits[9n-6, 9]}, idn9==Reverse[idn9]&&idn9[[1]]==3]; Select[ Range[2500], b9pQ] (* Harvey P. Dale, May 19 2023 *)

CROSSREFS

Sequence in context: A358863 A222594 A153431 * A137314 A032405 A344467

Adjacent sequences: A043071 A043072 A043073 * A043075 A043076 A043077

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

STATUS

approved