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 A234964 Numbers of the form 123...n - (n+1) 1
 9, 119, 1229, 12339, 123449, 1234559, 12345669, 123456779, 12345678899, 1234567890999, 123456789101099, 12345678910111199, 1234567891011121299, 123456789101112131399, 12345678910111213141499, 1234567891011121314151599, 123456789101112131415161699 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS Table of n, a(n) for n=2..18. EXAMPLE a(3) = 123 - 4 = 119. a(4) = 1234 - 5 = 1229. a(5) = 12345 - 6 = 12339. etc. PROG (Python) def Concatenate(x): ..num = '' ..for n in range(1, x+1): ....num += str(n) ..return int(num) {print(Concatenate(x)-(x+1)) for x in range(1, 50)} CROSSREFS Cf. A007908. Sequence in context: A340236 A087984 A197544 * A210046 A130652 A054051 Adjacent sequences: A234961 A234962 A234963 * A234965 A234966 A234967 KEYWORD nonn,base AUTHOR Derek Orr, Jan 02 2014 STATUS approved

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Last modified May 26 05:37 EDT 2024. Contains 372807 sequences. (Running on oeis4.)