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A084992
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Palindromes such that the difference between the consecutive terms are palindromes and this has not been the difference of any two consecutive terms earlier.
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0
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1, 2, 4, 7, 11, 22, 44, 77, 121, 222, 333, 454, 585, 787, 999, 1221, 2222, 3333, 4554, 5885, 7887, 9999, 12221
(list; graph; refs; listen; history; internal format)
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