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 A198486 Numbers with the property that all pairs of consecutive digits differ by 9. 1
 1, 2, 3, 4, 5, 6, 7, 8, 9, 90, 909, 9090, 90909, 909090, 9090909, 90909090, 909090909, 9090909090, 90909090909, 909090909090, 9090909090909, 90909090909090, 909090909090909, 9090909090909090, 90909090909090909, 909090909090909090, 9090909090909090909 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS MATHEMATICA t = {1, 2, 3, 4, 5, 6, 7, 8, 9}; Do[AppendTo[t, 10*t[[-1]]]; AppendTo[t, 10*t[[-1]] + 9], {9}]; t (* T. D. Noe, Oct 22 2013 *) PROG (Python) def A198486():     print('Numbers whose consecutive digits differ by 9')     for i in range(1, 100001):         b, n = True, i         if n > 9:             while n > 9:                 a = abs((n // 10) % 10 - n % 10)                 if a != 9: b = False                 n = n // 10         if b: print(i, end=', ')     return CROSSREFS Cf. A033075, A033088, A033081, A048406-A048410. Sequence in context: A078188 A240511 A345406 * A061805 A280658 A061219 Adjacent sequences:  A198483 A198484 A198485 * A198487 A198488 A198489 KEYWORD nonn,base AUTHOR Pieter Stadhouders, Oct 20 2013 EXTENSIONS More terms from T. D. Noe, Oct 22 2013 STATUS approved

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Last modified January 27 15:06 EST 2022. Contains 350607 sequences. (Running on oeis4.)