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 A082927 Numbers in which at least one pair of adjacent digits differ by 1. 4
 10, 12, 21, 23, 32, 34, 43, 45, 54, 56, 65, 67, 76, 78, 87, 89, 98, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 112, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 132, 134, 143, 145, 154, 156, 165, 167, 176, 178, 187, 189, 198, 201, 210, 211, 212, 213 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS FORMULA a(n) = n + O(x^0.915), where the exponent is the log(k)/log(10) with k the largest root of x^5 - 9x^4 + 4x^3 + 21x^2 - 9x - 5. - Charles R Greathouse IV, Mar 11 2014 EXAMPLE 1998 is a term because 8 and 9 differ by 1. MATHEMATICA Select[Range[250], MemberQ[Abs[Differences[IntegerDigits[#]]], 1]&] (* Harvey P. Dale, Apr 07 2018 *) PROG (PARI) isok(n) = (d = digits(n)) && (sum(i=1, #d-1, abs(d[i] - d[i+1])==1) >= 1); \\ Michel Marcus, Mar 11 2014 CROSSREFS Sequence in context: A337866 A357045 A320170 * A108965 A341002 A175885 Adjacent sequences: A082924 A082925 A082926 * A082928 A082929 A082930 KEYWORD base,easy,nonn AUTHOR Anonymous, Apr 15 2003 EXTENSIONS 120 added by Zak Seidov, Mar 11 2014 Name clarified by Jon E. Schoenfield, Oct 29 2022 STATUS approved

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Last modified January 27 10:15 EST 2023. Contains 359838 sequences. (Running on oeis4.)