Talk:Rare numbers: Difference between revisions
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m →comments concerning interesting observations from an webpage: added whitespace. |
m →comments concerning interesting observations from an webpage: elided incorrect observations. |
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I was considering adding checks (to the REXX program) to assert that for: |
I was considering adding checks (to the REXX program) to assert that for: |
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::* when the number of digits in a rare number is ''even'', the '''sum''' must be divisible by '''11''', and |
::* when the number of digits in a rare number is ''even'', the '''sum''' must be divisible by '''11''', and |
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::* when the number of digits in a rare number is ''odd'', the '''difference''' must be divisible by '''9'''. |
::* when the number of digits in a rare number is ''odd'', the '''difference''' must be divisible by '''9'''. |
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In fact, all the other (previous) checks (in the REXX program) have already filtered out the two (above) wrong cases, so the above two ''interesting observations'' are never observed to be false, so the checks are (at that point) in fact, redundant. |
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In fact, the webpage section contains a errors, the '''difference''' must be divisible by '''9''', not '''11''' as it states in the text. |
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Also, the mention of '''A<sup>2</sup>''' and '''B<sup>2</sup>''' having to be divisible by some number seems to be also wrong. I'm attempting to contact the author via e-mail. -- [[User:Gerard Schildberger|Gerard Schildberger]] ([[User talk:Gerard Schildberger|talk]]) 20:59, 8 September 2019 (UTC) |
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== the 1<sup>st</sup> REXX version == |
== the 1<sup>st</sup> REXX version == |
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