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add version number for clarity
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Deadcode
Deadcode
  • 11.9k
  • 1
  • 66
  • 52

RetinaRetina 0.8.2, 13 bytes

.+
$*
1
$`1
1

Try it online! Explanation: The first and last stages are just unary ⇔ decimal conversion. The middle stage replaces each 1 with the number of 1s to its left plus another 1 for the 1 itself, thus counting from 1 to n, summing the values implicitly.

Retina, 13 bytes

.+
$*
1
$`1
1

Try it online! Explanation: The first and last stages are just unary ⇔ decimal conversion. The middle stage replaces each 1 with the number of 1s to its left plus another 1 for the 1 itself, thus counting from 1 to n, summing the values implicitly.

Retina 0.8.2, 13 bytes

.+
$*
1
$`1
1

Try it online! Explanation: The first and last stages are just unary ⇔ decimal conversion. The middle stage replaces each 1 with the number of 1s to its left plus another 1 for the 1 itself, thus counting from 1 to n, summing the values implicitly.

Source Link
Neil
Neil
  • 177.3k
  • 12
  • 74
  • 281

Retina, 13 bytes

.+
$*
1
$`1
1

Try it online! Explanation: The first and last stages are just unary ⇔ decimal conversion. The middle stage replaces each 1 with the number of 1s to its left plus another 1 for the 1 itself, thus counting from 1 to n, summing the values implicitly.