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                    REVERSAL-ADDITION PALINDROME TEST ON 10921

                    Reverse and Add Process:

                    1. Pick a number.
                    2. Reverse its digits and add this value to the original number.
                    3. If this is not a palindrome, go back to step 2 and repeat.
                    Let's view this Reverse and Add sequence starting with 10921:
                    10921
                    + 12901
                    step 1: 23822
                    + 22832
                    step 2: 46654
                    + 45664
                    step 3: 92318
                    + 81329
                    step 4: 173647
                    + 746371
                    step 5: 920018
                    + 810029
                    step 6: 1730047
                    + 7400371
                    step 7: 9130418
                    + 8140319
                    step 8: 17270737
                    + 73707271
                    step 9: 90978008
                    + 80087909
                    step 10: 171065917
                    + 719560171
                    step 11: 890626088
                    + 880626098
                    step 12: 1771252186
                    + 6812521771
                    step 13: 8583773957
                    + 7593773858
                    step 14: 16177547815
                    + 51874577161
                    step 15: 68052124976
                    + 67942125086
                    step 16: 135994250062
                    + 260052499531
                    step 17: 396046749593
                    + 395947640693
                    step 18: 791994390286
                    + 682093499197
                    step 19: 1474087889483
                    + 3849887804741
                    step 20: 5323975694224
                    + 4224965793235
                    step 21: 9548941487459
                    + 9547841498459
                    step 22: 19096782985918
                    + 81958928769091
                    step 23: 101055711755009
                    + 900557117550101
                    step 24: 1001612829305110
                    + 0115039282161001
                    step 25: 1116652111466111
                    + 1116641112566111
                    step 26: 2233293224032222
                    + 2222304223923322
                    step 27: 4455597447955544
                    10921 takes 27 iterations / steps to resolve into a 16 digit palindrome.

                    REVERSAL-ADDITION PALINDROME RECORDS

                    Most Delayed Palindromic Number for each digit length
                    (Only iteration counts for which no smaller records exist are considered. My program records only the smallest number that resolves for each distinct iteration count. For example, there are 18-digit numbers that resolve in 232 iterations, higher than the 228 iteration record shown for 18-digit numbers, but they were not recorded, as a smaller [17-digit] number already holds the record for 232 iterations.)

                    DigitsNumberResult
                    2
                    3
                    4
                    5
                    6
                    7
                    8
                    9
                    10
                    11
                    12
                    13
                    14
                    15
                    16
                    17
                    18
                    19
                    89
                    187
                    1,297
                    10,911
                    150,296
                    9,008,299
                    10,309,988
                    140,669,390
                    1,005,499,526
                    10,087,799,570
                    100,001,987,765
                    1,600,005,969,190
                    14,104,229,999,995
                    100,120,849,299,260
                    1,030,020,097,997,900
                    10,442,000,392,399,960
                    170,500,000,303,619,996
                    1,186,060,307,891,929,990
                    solves in 24 iterations.
                    solves in 23 iterations.
                    solves in 21 iterations.
                    solves in 55 iterations.
                    solves in 64 iterations.
                    solves in 96 iterations.
                    solves in 95 iterations.
                    solves in 98 iterations.
                    solves in 109 iterations.
                    solves in 149 iterations.
                    solves in 143 iterations.
                    solves in 188 iterations.
                    solves in 182 iterations.
                    solves in 201 iterations.
                    solves in 197 iterations.
                    solves in 236 iterations.
                    solves in 228 iterations.
                    solves in 261 iterations - World Record!
                    [View all records]

                    This reverse and add program was created by Jason Doucette.
                    Please visit my Palindromes and World Records page.
                    You have permission to use the data from this webpage (with due credit).
                    A link to my website is much appreciated. Thank you.

                    (This program has been run 2,095,774 times since Saturday, March 9th, 2002.)

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