Odd-indexed terms of A104266 ============================ For each odd value of n, a(n) is relatively close to 10^n, so sqrt(a(n)) is relatively close to 10^(n/2), and nearly all the digits that are more significant than the central digit are 9's. central digit | | v <- digits more significant than central digit --> <-- digits less significant than central digit -> 1 9 3 9 6 1 5 99 8 56 7 999 8 244 9 9998 8 7641 11 99999 5 15529 13 999999 5 824729 15 9999999 6 1946176 17 99999999 3 56895225 19 999999998 6 285964964 21 9999999993 8 7543134464 23 99999999997 5 72677916169 25 999999999999 1 276338467889 27 9999999999996 3 3598272415684 29 99999999999997 5 12425971383556 31 999999999999985 2 435482263742736 33 9999999999999999 7 9762122758866849 35 99999999999999999 8 73578871987712489 37 999999999999999989 2 489557393719869225 39 9999999999999999994 9 4735358317535929344 41 99999999999999999989 3 18234349875172511489 43 999999999999999999986 7 857622397357533392484 45 9999999999999999999985 4 9435135562124454241156 47 99999999999999999999996 6 13552731755839497613456 49 999999999999999999999996 4 933928551748365633236544 51 9999999999999999999999993 3 9442749326377962122655625 53 99999999999999999999999992 7 62639411769651787444971649 55 999999999999999999999999995 9 315915773335114456258157444 57 9999999999999999999999999974 4 9484854214333524985284643216 59 99999999999999999999999999998 5 63153766937374924839726422481 61 999999999999999999999999999994 4 859151178452113779941661491776 63 9999999999999999999999999999944 2 2669564641843791354188278289121 65 99999999999999999999999999999978 5 89247628741513842431172963924644 67 999999999999999999999999999999999 6 624461147975812674369332428867524 69 9999999999999999999999999999999971 9 5869539866245388477796278229233881 71 99999999999999999999999999999999961 8 17422755522395678894873326469434849 73 999999999999999999999999999999999931 8 721714439271865232389728724199917476 75 9999999999999999999999999999999999994 8 1667818327136641375316852391512838241 77 99999999999999999999999999999999999983 5 84291626599512655919292936797731395716 79 999999999999999999999999999999999999944 6 252677757873755799548672964628315111424 81 9999999999999999999999999999999999999979 4 1269126226251117456212455598465988888569 83 99999999999999999999999999999999999999985 1 28483296795223398354415643582798325412624 85 999999999999999999999999999999999999999843 6 953665835481235867468119291894587731998864 87 9999999999999999999999999999999999999999923 8 5662164665319777334786388415884228687275761 89 99999999999999999999999999999999999999999984 2 31288734235824218817736618823453119797229121 91 999999999999999999999999999999999999999999995 9 995816265414777233235924476646519367426647689 93 9999999999999999999999999999999999999999999987 8 2385967489651535482618766765444246415873287876 95 99999999999999999999999999999999999999999999772 6 18522899341283859498832292491625615354187226329 97 999999999999999999999999999999999999999999999894 8 752483368873844798295156968746265784127855227281 99 9999999999999999999999999999999999999999999999925 2 6382482886938251955348348956974899672648222341956