What happened to block 1551? (blockchain.info)

[kefir]

Looking at the bitcoin block chain on blockchain.info, I was wondering what happened to block #1551. Have a look here:

http://blockchain.info/block-index/1551

You'll see that this is block #1550, I've just addressed it by the block-index number in the URL, and they follow one another. However, the address for the next block is:

http://blockchain.info/block-index/3104

Why does block #1551 have block-index 3104 and not 1552? The block-index had incremented by 1 along with the block number from the start, but when I was expecting an increment by 1 from 1551 to 1552, it incremented by 1553 from 1551 to 3104. Is this just a peculiarity of blockchain.info's URLs? I notice that 1552 + 1552 = 3104, but that doesn't mean anything to me.



MOD EDIT:
Added (blockchain.info) to the title to make this less confusing.

[kjj]

It means that blockchain.info, which is totally not "the blockchain", used a parser that assigned index numbers that have no relation to the sequence in the chain.

Can we get a stick at the top that "blockchain.info != blockchain != bitcoin" ?  I'm getting tired of these threads in here.

[DannyHamilton]

- snip -

Is this just a peculiarity of blockchain.info's URLs?

- snip -

Yes.

[MPOE-PR]

It means that blockchain.info, which is totally not "the blockchain", used a parser that assigned index numbers that have no relation to the sequence in the chain.

Can we get a stick at the top that "blockchain.info != blockchain != bitcoin" ?  I'm getting tired of these threads in here.

Right under the bitcoin.org != bitcoin one?