Math puzzle of the day

[barking_iguana]

Identify the next number in the seuqence:
1, 3, 5, 7, 9, 15, 17, 21,...

Comments

[stormlorde.livejournal.com]

27

[barking-iguana.livejournal.com]

Yes.

[jayeye.livejournal.com]

you should know better than ask such questions on the net.

I assume you are familiar with Neil Sloane's encyclopaedia of integer sequences? (I also have his book!)

http://www.research.att.com/~njas/sequences/index.html

[barking-iguana.livejournal.com]

I figured it might be fun for those who don't choose to use outside references. Of course it can also be fun to see and show how good you are at using references.

And yes, I've looked at Sloane's sequences a few times. Some of them seen too arbitrary to me, but it's interesting.

[barking-iguana.livejournal.com]

I take back what I said about Sloane. It's his list of what's special about whole numbers that I looked at and thought sometimes too arbitrary.