44744: Near Repdigit Palindrome 44..44744..44

First few terms (base 10): \[[4^*74^*_9]_n=\{7,391,29767,2393671,193729927,\ldots\}\]

First few terms (base 9): \[\{\text{7},\text{474},\text{44744},\text{4447444},\text{444474444},\ldots\}\]

General Formula:\[[4^*74^*_9]_n={9\cdot9^{2n}+6\cdot9^{n}-1\over2}\]

Equivalent Patterns: (none)

Table

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