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A117640
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Concatenation of first n numbers in base 4.
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7
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1, 12, 123, 12310, 1231011, 123101112, 12310111213, 1231011121320, 123101112132021, 12310111213202122, 1231011121320212223, 123101112132021222330, 12310111213202122233031
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OFFSET
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1,2
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COMMENTS
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Concatenation of the first n terms of A007090.
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LINKS
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MATHEMATICA
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Table[FromDigits[Flatten[Table[IntegerDigits[n, 4], {n, k}]]], {k, 15}] (* Harvey P. Dale, Jan 18 2023 *)
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PROG
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(Python)
from gmpy2 import digits
def A117640(n): return int(''.join(digits(n, 4) for n in range(1, n+1))) # Chai Wah Wu, Apr 19 2023
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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