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A116152
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Numbers n such that n concatenated with n-1 gives the product of two numbers which differ by 7.
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5
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9, 11, 45, 18281, 32769, 56891, 180689, 330539, 959481, 1850201, 3247409, 4940219, 2425563239, 2575561739, 6003563495, 7245212645, 7770160145, 4983798265289, 5049762270381, 5534298528989, 5603798594169
(list; graph; refs; listen; history; internal format)
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