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Is there a way to concatenate the elements of a list into ONE number?

For example, if there is a list L={13,5,8,0}, then I am looking for a way to append 13, 5, 8 and 0 to produce the result 13580.

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You can convert the list numbers to strings, then join and finally convert back to number:

L = {13, 5, 8, 0};

ToExpression[StringJoin[ToString /@ L]]
(* 13580 *)
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FromDigits @ StringJoin @ IntegerString @ L

13580

FromDigits @ StringJoin @ IntegerString @ {13, 5, 38, 13}

1353813

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Or FromDigits:

FromDigits[{13, 5, 8, 0}]

13580
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  • 2
    $\begingroup$ (+1) you will need something like FromDigits[Flatten@IntegerDigits@L] to cover cases like L={1, 13, 5, 8, 0}. $\endgroup$ – kglr Jan 19 at 5:33
  • $\begingroup$ @kglr 's comment, and answer, show the proper way to use IntegerDigits. Please see those. $\endgroup$ – Christopher Lamb Jan 19 at 6:13

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