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Möbius function for positive integers

This task says to write a function to ... find the Möbius number for a positive integer n.

But it is also apparently being used to find the Möbius number for zero, a non-positive number, as zero is apparently the 1^st term as shown in the task's first written example's output.

Could/should it be stated: ... find the Möbius number for a non-negative integer n ?

Or, should solutions treat zero as a special case? -- Gerard Schildberger (talk) 22:12, 25 January 2020 (UTC)

Zero is not a positive integer. The Möbius function is undefined at zero. No need to special case it. I don't see any examples that show a Möbius number for zero. Which ones are showing a value at zero? The only example that shows ANYTHING for an input of zero is the REXX example, and while that's a little odd, I wouldn't count it as wrong, as it specifically states that "bullet (•) to signify that a "null" is being shown (for the 0th entry)" ¯\_(ツ)_/¯ If REXX can't easily skip over zero, I'm not going to hold that against it. --Thundergnat (talk) 22:51, 25 January 2020 (UTC)

Revision as of 22:12, 25 January 2020 (view source) rosettacode>Gerard Schildberger (added a talk topic.)		Revision as of 22:52, 25 January 2020 (view source) Thundergnat (talk \| contribs) (→‎Möbius function for positive integers: Comment) Newer edit →
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	Or, should solutions treat zero as a special case?     -- [[User:Gerard Schildberger\|Gerard Schildberger]] ([[User talk:Gerard Schildberger\|talk]]) 22:12, 25 January 2020 (UTC)		Or, should solutions treat zero as a special case?     -- [[User:Gerard Schildberger\|Gerard Schildberger]] ([[User talk:Gerard Schildberger\|talk]]) 22:12, 25 January 2020 (UTC)

			:Zero is not a positive integer. The Möbius function is undefined at zero. No need to special case it. I don't see any examples that show a Möbius number for zero. Which ones are showing a value at zero? The only example that shows ANYTHING for an input of zero is the REXX example, and while that's a little odd, I wouldn't count it as wrong, as it specifically states that "bullet (•) to signify that a "null" is being shown (for the 0th entry)" ¯\_(ツ)_/¯ If REXX can't easily skip over zero, I'm not going to hold that against it. --[[User:Thundergnat\|Thundergnat]] ([[User talk:Thundergnat\|talk]]) 22:51, 25 January 2020 (UTC)