The odd numbers 1 3 5 7 are increased by 11 each time
While the even numbers 2 4 6 are halved each time.
I guess you could write the sequence like this: S(n) = If n odd, then (n+3)*11; If n even, then n/2
22, 33, 44, 55, 66, 77, 88, 99
11, 22, 33, 44, 55, 66, 77, 88, 99, . . .
66
There are nine two-digit palindromes: 11, 22, 33, 44, 55, 66, 77, 88 and 99.
11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198...
55, 66
11, 22, 33, 44, 55, 66, 77, 88, 99, . . . 12, 24, 36, 48, 60, 72, 84, 96, 108, . . .
SystemSizesSystemEurope3535½363737½3838½3940414243444546½48½EuropeMexico4.555.566.577.59101112.5MexicoJapanM21.52222.52323.52424.52525.52626.527.528.529.530.531.5JapanMW2121.52222.52323.52424.52525.5262728293031JapanWU.K.M33½44½55½66½77½88½10111213½U.K.MW2½33½44½55½66½77½89½10½11½13U.K.WAustraliaM33½44½55½66½77½88½10111213½AustraliaMW3½44½55½66½77½88½910½11½12½14AustraliaWU.S. & CanadaM3½44½55½66½77½88½910½11½12½14U.S. & CanadaMW55½66½77½88½99½1010.512131415.5U.S. & CanadaWRussia & Ukraine *W33½343536373839Russia & UkraineWKorea (mm.)228231235238241245248251254257260267273279286292KoreaInches991/89¼93/89½95/89¾97/810101/810¼10½10¾1111¼11½InchesCentimeters22.823.123.523.824.124.524.825.125.425.72626.727.327.928.629.2CentimetersMondopoint228231235
11, 22, 33, 44, 55, 66, 77
11 22 33 44 55 66 77
22, 33, 44, 55, 66, 77, 88, 99
11, 22, 33, 44, 55, 66, 77, 88, 99 +11 . . .
11, 22, 33, 44, 55, 66, 77, 88, 99, . . .
11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198, 209, 220.
66
11, 22, 33, 44, 55, 66, 77, 88, 99.
11 22 33 44 55 66 77 88 99 110