Well, Wolfram|Alpha is not Mathematica and in general, Mathematica syntax does not work with it. W|A has a natural language interface, which makes it possible to ask questions without learning a programming language. But it can also be very frustrating to get it to do what you want (at least I find it very frustrating and unpredictable).

Try telling it to

select primes from {1, 2, 6, 15, 37, 90, 218, 527, 1273, 3074}

Based on the interpretation of this natural language query above, I tried

Select[{1, 2, 6, 15, 37, 90, 218, 527, 1273, 3074}, PrimeQ[#1]&]

which also works.

In[1]:= Select[{1, 2, 6, 15, 37, 90, 218, 527, 1273, 3074}, PrimeQ]

Out[1]= {2, 37}

Thank you, both terms work in Wolfram|Alpha.

And you are right, the natual language interpretation is strange sometimes as this link shows:

select primes from LinearRecurrence[{0,7,0,-7,0,1},{1,2,6,15,37,90},20]

Should have returned the same as your terms, but does something completely different.

I really like Wolfram|Alpha for two reasons:

• its free
• you can easily share link for an evaluation

I know Mathematica is free for Raspberry Pi, but is some "more Mathematica like" web interface than Wolfram/Alpha out there?

Hermann.