From _Chai Wah Wu_, Oct 1 2019
Decomposition of A308803(n) for odd n
a(1) = 9 = 3 * 3
a(3) = 999 = 27 * 37
a(5) = 99999 = 123 * 813
a(7) = 9999999 = 2151 * 4649
a(9) = 999969999 = 16667 * 59997
a(11) = 99999999999 = 194841 * 513239
a(13) = 9999998999999 = 2893921 * 3455519
a(15) = 999999999999999 = 11099889 * 90090991
a(17) = 99999999799999999 = 265412903 * 376771433
a(19) = 9999999997999999999 = 2441330309 * 4096127411
a(21) = 999999999999999999999 = 19845575559 * 50389065161
a(23) = 99999999999899999999999 = 345867517613 * 289128047323
a(25) = 9999999999999999999999999 = 1336296395439 * 7483369733041
a(27) = 999999999999979999999999999 = 17370412185817 * 57569157789847
a(29) = 99999999999999999999999999999 = 134192329829079 * 745199074547481
a(31) = 9999999999999996999999999999999 = 1666666666666667 * 5999999999999997
a(33) = 999999999999999979999999999999999 = 30780744305138969 * 32487843376582871
a(35) = 99999999999999999999999999999999999 = 108296696315884841 * 923389202089003239
a(37) = 9999999999999999996999999999999999999 = 1165378306066895937 * 8580904542276568127
a(39) = 999999999999999999979999999999999999999 = 14699440814738575643 * 68029798725223456493
a(41) = 99999999999999999999699999999999999999999 = 199999999999999999999 * 500000000000000000001
a(43) = 9999999999999999999999999999999999999999999 = 2999827898699767447027 * 3333524567970834980037
a(45) = 999999999999999999999999999999999999999999999 = 21503007801367992177129 * 46505121945608993221031
a(47) = 99999999999999999999999699999999999999999999999 = 258024017986977231166971 * 387560820035936014949069
a(49) = 9999999999999999999999997999999999999999999999999 = 5191941912888233200348147 * 1926061610045456943864517
a(51) = 999999999999999999999999999999999999999999999999999 = 14159533709514457213207191 * 70623794576515816214160089
a(53) = 99999999999999999999999999999999999999999999999999999 = 235410588173602936678914241 * 424789729195422830941800639
a(55) = 9999999999999999999999999999999999999999999999999999999 = 1940082774570324538920769413 * 5154419250083145276043769523
a(57) = 999999999999999999999999999999999999999999999999999999999 = 11932090409999999998806790959 * 83807611712523053209081408561
a(59) = 99999999999999999999999999999699999999999999999999999999999 = 199999999999999999999999999999 * 500000000000000000000000000001
a(61) = 9999999999999999999999999999999999999999999999999999999999999 = 1419807144820398384184589100267 * 7043210084187153397968995982397
a(63) = 999999999999999999999999999999999999999999999999999999999999999 = 24748444947159258130625296897467 * 40406579166291604161411690797197
a(65) = 99999999999999999999999999999999899999999999999999999999999999999 = 226128257027567673024489745247491 * 442226908368240034625453159586389
a(67) = 9999999999999999999999999999999996999999999999999999999999999999999 = 2618650506847538036730231092826301 * 3818760836488446976398570468136299
a(69) = 999999999999999999999999999999999969999999999999999999999999999999999 = 16666666666666666666666666666666667 * 59999999999999999999999999999999997
a(71) = 99999999999999999999999999999999999699999999999999999999999999999999999 = 199999999999999999999999999999999999 * 500000000000000000000000000000000001
a(73) = 9999999999999999999999999999999999996999999999999999999999999999999999999 = 1999999999999999999999999999999999999 * 5000000000000000000000000000000000001
a(75) = 999999999999999999999999999999999999999999999999999999999999999999999999999 = 15100151001509999999999998489984899849 * 66224503311258344370198682119205297351
a(77) = 99999999999999999999999999999999999999699999999999999999999999999999999999999 = 199999999999999999999999999999999999999 * 500000000000000000000000000000000000001
a(79) = 9999999999999999999999999999999999999996999999999999999999999999999999999999999 = 1999999999999999999999999999999999999999 * 5000000000000000000000000000000000000001
a(81) = 999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 11315060094332999999999999988684939905667 * 88377789570983978556045513843723192150997
a(83) = 99999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 288271071899799296117523180870636231856587 * 346895716385857804544741137394505425384477
a(85) = 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 2368489547189609416000736628103905603143679 * 4222100119405530170179331190291488789678081
a(87) = 999999999999999999999999999999999999999999969999999999999999999999999999999999999999999 = 19999999999999999999999999999999999999999999 * 50000000000000000000000000000000000000000001
a(89) = 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 165923362176077634566405989563869883687925161 * 602687883662097824795428942608391280317235559
a(91) = 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 1192333609704362658651829982815068719956899573 * 8386914466396267312266655365369988875774835363
a(93) = 999999999999999999999999999999999999999999999989999999999999999999999999999999999999999999999 = 48743778648527705064822703110268620853491205127 * 20515438641115788351058733141533756646066148937
a(95) = 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 = 176297435033282770993721052733338389565531587043 * 567223226935328011071698296279624018372021335093