To identify an integer sequence try the Online Encyclopedia of Integer Sequences
Simply type in your sequence and choose Search.

Note that you can list, graph or even listen to the sequence!

There are more pages available, try Puzzles for some unusual sequences. Some of these are fun to try with students, try the eban sequence: 2, 4, 6, 30, 32, 34, 36, 40, 42, 44, 46, ….

On a similar theme, we also have the iban sequence: 0, 1, 2, 3, 4, 7, 10, 11, 12, 14, 17 ….

Alternatively, simply type the sequence into Wolfram Alpha.

Typing ‘Sequences’ into WolframAlpha shows several possibilities for queries on sequences.

For more on WolframAlpha see the WolframAlpha pages.