Another Sequence

**davee123** · Dec23-08, 05:32 PM

What's the next number?

1, 3, 11, 13, 17, 23, 73, ?

DaveE

**davee123** · Dec30-08, 10:56 PM

Alright, more numbers in the sequence:

1, 3, 11, 13, 17, 23, 73, 101, 103, 111, 113, 117, 123, 173, 323, 373, ?

DaveE

**mabs239** · Jan1-09, 03:17 AM

A really teasing sequence.

Though I am trying to figure out for so many days, but failed. Anyway I would make a blind guess:

No, wait a minute:

...1103, 1111, 1113, 1117, 1123, 1173, 1323, 1373, 3323, 3373, 11373, 13323, 13373, 17373, 23323, 23373, 73373, 101373, 103323, 103373, 111373, 113323, 113373, 117373

Not my own work ;)

Every next number is the one next with more number of letters.

It added to the confusion that the first sequence contains prime numbers except the first one.

**davee123** · Jan5-09, 10:34 AM

Originally Posted by mabs239

Every next number is the one next with more number of letters.

Ding!

Originally Posted by mabs239

It added to the confusion that the first sequence contains prime numbers except the first one.

I didn't even notice that, but that's an interesting point! The first 9 numbers are all coincidentally prime, excluding 1, which is sort of a prime number anyway on certain technicalities.

I think I had heard some variant on the sequence before, but I couldn't seem to find it, so I figured it'd be worth posting...

DaveE

**chaoseverlasting** · Jan6-09, 02:24 PM

Originally Posted by davee123

I didn't even notice that, but that's an interesting point! The first 9 numbers are all coincidentally prime, excluding 1, which is sort of a prime number anyway on certain technicalities.

DaveE

Thats what lead me off. I was wondering how primes fit into all of it.