HP 38G: Better than Prime for some Sequences using the built in Sequence App

[Didier Lachieze]

Here is a way to do it on the Prime Sequence app without performance issues by using the Sequence app variables:

• select the Sequence app
• go to Home
• got to Programs
• open Sequence(App)
• replace the program with the one below:
  

Code:

EXPORT TT(n)
BEGIN
IF n≤2 THEN
  RETURN(1);
ELSE
  RETURN(U1(U1(n-1))+U1(n-U1(n-1)));
END;
END;

• then go back to the Sequence app
• enter U1(N)=TT(N)
• go to Num view to see all the values
  

EDIT: display is smooth until N=361, after that it's much slower. I don't know why.