Is there a reason for this?

[Jammy01]

I was trying to copy the URL of a thread then I noticed there's a .0 after the topicID and when I also checked the next page it increased to .20 and the next .40

What does this mean?

[promise444c5]

Pagination..
it means topicId.{after x number of post }

[Donneski]

You're a newbie, it's okay to not understand certain things especially when they seem to appear conflicting.

There's nothing unusual in what you noticed. It's just how the forum software SMF URL structure for thread pages. There are 20 posts per page so .0 is for the first page , .20 page the second page, .40 the third page and so on. So you can easily edit that number to jump to the page you want when there are multiple pages in a thread.

[promise444c5]

So you can easily edit that number to jump to the page you want when there are multiple pages in a thread.

Not as easy as just clicking the numbers and let the forum handle it unless you can comfortably deal with editing the topicId with multiples of 20.

Hence don’t forget that you have to deal with subtracting 1 from the page you want to access before multiplying by 20 because page one is usually 0 .. i.e if you want to access page 10 you have to do 20 x 9 . That’s a lot of stress already
 

[SamReomo]

I was trying to copy the URL of a thread then I noticed there's a .0 after the topicID and when I also checked the next page it increased to .20 and the next .40

What does this mean?

It means you're at first page when you see .0 even if you replace it with .19 you'll still be at first page of the thread because there are 20 posts per thread, but when you add .20 or any number between .20 to .39 you'll be at page 2, and similarly from .40 to .59 for page 3 and so on. That's what I understood after testing it, but if I'm wrong then someone should correct me.

[OcTradism]

I was trying to copy the URL of a thread then I noticed there's a .0 after the topicID and when I also checked the next page it increased to .20 and the next .40

What does this mean?

Like your post, that is an opening post of this thread, it's #0.
You will get it if you click on the topic title in this line "Bitcoin Forum > Other > Meta > Is there a reason for this?"
Click on "Is there a reason for this?" you will get that link

But if you click on "Is there a reason for this?" at lower places like your post, you will get the post ID in this forum.
It's like https://bitcointalk.org/index.php?topic=5590054.msg66999410#msg66999410
If you click on #2 at right side of a second post, or click on "is there a reason for this" of a second post, you will get this same link https://bitcointalk.org/index.php?topic=5590054.msg66999410#msg66999410

[Donneski]

So you can easily edit that number to jump to the page you want when there are multiple pages in a thread.

Not as easy as just clicking the numbers and let the forum handle it unless you can comfortably deal with editing the topicId with multiples of 20.

Hence don’t forget that you have to deal with subtracting 1 from the page you want to access before multiplying by 20 because page one is usually 0 .. i.e if you want to access page 10 you have to do 20 x 9 . That’s a lot of stress already
 

What you said is true though . Apart from being stressful, it's also not necessary when the thread is less than 10 pages where you can easily click on the desired page number at the top or bottom of each page.

However, you can still apply the method as a quick url trick when a thread has more than 100 pages or if you prefer typing over clicking. That might be a huge mental math for a newbie but for experienced forum members, it could be fun playing with numbers

[knowngunman]

I was trying to copy the URL of a thread then I noticed there's a .0 after the topicID and when I also checked the next page it increased to .20 and the next .40

What does this mean?

You have gotten enough feedback that answers your question. You can lock the thread now.

This is not really a problem to worry about as long as the link is not broken when you copy it. The link can not break even if you change that number, it can only jump you to appropriate page that correspond with the number you insert. It is something you can completely ignore unless you're interested in coding.

It means you're at first page when you see .0 even if you replace it with .19 you'll still be at first page of the thread because there are 20 posts per thread, but when you add .20 or any number between .20 to .39 you'll be at page 2, and similarly from .40 to .59 for page 3 and so on. That's what I understood after testing it, but if I'm wrong then someone should correct me.

You're right. If you input a number greater than the actual page number available in that thread, you'll be redirected to the latest page. But alternatively the main ID takes you to a different thread entirely.

[Upgrade00]

If you want to edit the url to allow you access all the pages at once, just add an ";all" to the url on the first page. It loads without the need for captcha which you will be required to enter if you click on "all" when on the thread in the board. This only works for topics that have less than 25 pages of replies.