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A083835
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Palindromes n such that 6n + 1 is also a palindrome.
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3
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1, 9, 99, 121, 131, 999, 9999, 12021, 12121, 13031, 13131, 99999, 999999, 1202021, 1203021, 1212121, 1213121, 1302031, 1303031, 1312131, 1313131, 9999999, 99999999, 120202021, 120212021, 120303021, 120313021, 121202121, 121212121
(list; graph; refs; listen; history; internal format)
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