44144: Near Repdigit Palindrome 44..44144..44

First few terms (base 10): \[[4^*14^*_7]_n=\{1,207,11057,547999,26895201,\ldots\}\]

First few terms (base 7): \[\{\text{1},\text{414},\text{44144},\text{4441444},\text{444414444},\ldots\}\]

General Formula:\[[4^*14^*_7]_n={14\cdot7^{2n}-9\cdot7^{n}-2\over3}\]

Equivalent Patterns: (none)

Table

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