74444: Near Repdigit 744..44

First few terms (base 10): \[[74^*_9]_n=\{7,67,607,5467,49207,\ldots\}\]

First few terms (base 9): \[\{\text{7},\text{74},\text{744},\text{7444},\text{74444},\ldots\}\]

General Formula:\[[74^*_9]_n={15\cdot9^{n}-1\over2}\]

Equivalent Patterns: \[[24^*3_9]_n=3\cdot[74^*_9]_n\] \[[48^*6_9]_n=6\cdot[74^*_9]_n\]

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