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 A083825 a(1) = 12; then numbers obtained at every stage of division by 9 in the following process. multiply by 9, reverse the digits, divide by 9, reverse the digits, multiply by 9, reverse the digit, divide by 9, ... 3
 12, 89, 32, 78, 43, 67, 54, 56, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65, 65 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The interesting pattern of terminating at 65 after which every term is 65 is visible. 89 onwards alternate terms are obtained by subtracting 11 and 32 onwards alternate terms are obtained by adding 11 and both terminate at 65. Conjecture: Every such sequence for an n-digit number not divisible by 10 terminates in another n-digit number. Let it be t(n), then one also gets t(10k) =t(k). E.g. t(12) = 65. Subsidiary sequence:(1) a(n) = t(n), a(10k) = a(k). (2). The index of the first occurrence of t(n). A measure of the length of the cycle. LINKS Table of n, a(n) for n=1..19. EXAMPLE *12--->108--->801--->*89--->98--->882---288-->*32--->23--->207--->702--->*78--->87--->783--->387--->*43--->34--->306--->603--->*67--->76... CROSSREFS Cf. A083822, A083823, A083824. Sequence in context: A181704 A009657 A012088 * A181944 A359311 A193285 Adjacent sequences: A083822 A083823 A083824 * A083826 A083827 A083828 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 09 2003 STATUS approved

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Last modified May 30 10:33 EDT 2023. Contains 363050 sequences. (Running on oeis4.)