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A116281
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Numbers n such that n times n+5 gives the concatenation of two numbers m and m-1.
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5
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39, 57, 32262231, 67737765, 79321055, 3341093417798787499092, 3861488851737861033960, 4747922651210186579786, 5252077348789813420210, 6138511148262138966036, 6658906582201212500904, 7232275368591793618230
(list; graph; refs; listen; history; internal format)
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