which number best completes the sequence 1 1 3 2 4 6 5 25

[Ken Sp.]

This is baffling--any clues?
which number best completes the sequence 1 1 3 2 4 6 5 25 ?

[sscutchen]

27

[Carm]

1*1=1+2=3-1=2*2=4+2=6-1=5*5=25+2=27-1=26x26=

[threeprong]

...

[Carm]

*=X=multiply. I was working on it.

First post got it along with me. I was just extending the pattern.

27-1=26x26

Carm

[wurm]

30

Think of the sequence as 1 1 3, 2 4 6, 5 25 ?

Edited for typo. I should have changed my answer while I was at it.

[mikebw]

Start with 1; square; add 2; subtract 1; repeat.

1, 1, 3, 2, 4, 6, 5, 25, 27, 26, 676, 678, 677, 458329, 458331, 458330, 210066388900, 210066388902, 210066388901, 44127887745906175987801, 44127887745906175987803, 44127887745906175987802

[birdmanjeff]

[quote Carm]1*1=1+2=3-1=2*2=4+2=6-1=5*5=25+2=27-1=26x26=
Beat me to it, I agree, it is a tough one.

[Carm]

Thanks mikebw for listing it, I was looking for that freaking square symbol on my keyboard.

Carm

[Ken Sp.]

Thanks for the quick answers--I have 2 more out of many-I get most of these--but not these

More number sequences
3 9 4 5 25 20 21 441 ?

2 6 3 8 6 12 ?

Thanks