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.