A030149 - OEIS

A030149

Even palindromes in which parity of digits alternates.

0, 2, 4, 6, 8, 212, 232, 252, 272, 292, 414, 434, 454, 474, 494, 616, 636, 656, 676, 696, 818, 838, 858, 878, 898, 21012, 21212, 21412, 21612, 21812, 23032, 23232, 23432, 23632, 23832, 25052, 25252, 25452, 25652, 25852, 27072, 27272, 27472

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

OFFSET

1,2

LINKS

Giovanni Resta, Table of n, a(n) for n = 1..10000

MATHEMATICA

altQ[n_] := n < 10 || Union[Total /@ Partition[ Mod[ IntegerDigits@ n, 2], 2, 1]] == {1}; palQ[n_] := Block[{d = IntegerDigits[n]}, d == Reverse@ d]; Select[2 Range[0, 15000], palQ[#] && altQ[#] &] (* Giovanni Resta, Aug 16 2018 *)

CROSSREFS

Cf. A030147, A030148, A030150.

Sequence in context: A119666 A087302 A351777 * A083146 A306091 A074108

Adjacent sequences: A030146 A030147 A030148 * A030150 A030151 A030152

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

EXTENSIONS

a(1) = 0 prepended and offset changed by Giovanni Resta, Aug 16 2018

STATUS

approved