22221: Near Repdigit 22..221
First few terms (base 10): \[[2^*1_{10}]_n=\{1,21,221,2221,22221,\ldots\}\]
General Formula:\[[2^*1_{10}]_n={20\cdot10^{n}-11\over9}\]
Equivalent Patterns: \[[6^*3_{10}]_n=3\cdot[2^*1_{10}]_n\] \[[4^*2_{10}]_n=2\cdot[2^*1_{10}]_n\] \[[8^*4_{10}]_n=4\cdot[2^*1_{10}]_n\] \[[5^*25_{10}]_n=25\cdot[2^*1_{10}]_n\]
See Also: Factorization of 22..221 on stdkmd.net
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