seq |count> => |1> . |2> . |3> . |4> . |5> . |6> . |7> . |8> . |9> . |10>
seq |fib> => |1> . |1> . |2> . |3> . |5> . |8> . |13>
seq |fact> => |1> . |2> . |6> . |24> . |120>
seq |primes> => |2> . |3> . |5> . |7> . |11> . |13> . |17> . |19> . |23>