17777: Near Repdigit 177..77

First few terms (base 10): \[[17^*_8]_n=\{1,15,127,1023,8191,\ldots\}\]

First few terms (base 8): \[\{\text{1},\text{17},\text{177},\text{1777},\text{17777},\ldots\}\]

General Formula:\[[17^*_8]_n=2\cdot8^{n}-1\]

Equivalent Patterns: \[[57^*5_8]_n=3\cdot[17^*_8]_{n+1}\] \[[37^*6_8]_n=2\cdot[17^*_8]_{n+1}\] \[[7^*4_8]_n=4\cdot[17^*_8]_n\]

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