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Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-9.

4

`%I #12 Jul 18 2021 02:49:18
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`%S 8,98,998,9998,99998,999998,9999998,99999998,999999998,9999999998,
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`%T 36363636361,45454545452,54545454543,63636363634,72727272725,
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`%U 81818181816,90909090907,99999999998,999999999998,9999999999998
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`%N Numbers k such that k*(k+6) gives the concatenation of two numbers m and m-9.
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`%e 99999998 * 100000004 = 100000001//99999992, where // denotes concatenation.
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`%Y Cf. A099150, A116098, A116228, A116230, A116237.
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`%K nonn,base
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`%O 1,1
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`%A _Giovanni Resta_, Feb 06 2006
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