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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
OFFSET
2,1
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
KEYWORD
nonn,base
AUTHOR
Derek Orr, Jan 02 2014
STATUS
approved