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Numbers that are the product of two palindromes in two or more ways and are the concatenation of two palindromes, with all the palindromes having the same number of decimal digits.
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%I #18 Sep 04 2022 12:45:19

%S 12,16,18,24,36,113131311886868688,153535351846464648,

%T 182919281817080718,183838381816161618,185676581814323418,

%U 192919291807080708,193838391806161608,283919382716080617,293656392403040304,293919392706080607,365838563634161436,385838583614161416,387676783612323216,567838765432161234,587838785412161214

%N Numbers that are the product of two palindromes in two or more ways and are the concatenation of two palindromes, with all the palindromes having the same number of decimal digits.

%C Numbers in A355148 with more than 1 decomposition.

%e 12 = 3*4 = 2*6.

%e 16 = 4*4 = 2*8.

%e 18 = 2*9 = 3*6.

%e 24 = 4*6 = 3*8.

%e 36 = 4*9 = 6*6.

%e 113131311886868688 = 279747972*404404404 = 254545452*444444444 = 252252252*448484844.

%e 153535351846464648 = 189828981*808808808 = 172727271*888888888.

%Y Cf. A002113, A355148.

%K nonn,base

%O 1,1

%A _Chai Wah Wu_, Sep 01 2022