# Product just for the even numbers?

GROUPS:
 How to compute a product just for the even numbers? The multiplication must be computed for i being 0, 2, 4, 6, 8, 10, so on until 60, 62 and 64 and not for all the i from 0 to 64 as in example... How the input should be look like? I tried something as " where i is even", "even(i)" but no success...Here is example input in W|A: product (2^i+1), i=0 to 64 
Answer
5 months ago
3 Replies
 Valeriu Ungureanu 1 Vote In Mathematica: Product[1 + 2^i, {i, 0, 64, 2}] 
Answer
5 months ago
 This can't be done using WolframAlpha's engine?
Answer
5 months ago
 Yes, it can be done: product 1 + 2^(2i), i = 0 to 32 Exactly the same result is found by Mathematica: In[8]:= Product[1 + 2^i, {i, 0, 64, 2}] Out[8]= 20938047277156744484034659764096189108263758406006051370922858\ 6118246862458142924512702592682151377556998653509642018354565232926801\ 5845410033321503967023531688970809328414948820703193048389035777448706\ 6402449391971662407986932466355936361560726425018122283263943137284411\ 01056546992945870757184144578986549377441406250 
Answer
5 months ago