Casio fx-115ES Plus

[Joe Horn]

(09-12-2014 08:54 AM)Don Shepherd Wrote:  

(09-12-2014 03:31 AM)Gerson W. Barbosa Wrote:  Easier than 1 ENTER + g LSTx x<>y + g LSTx x<>y +... ?

P.S.: Or, on the WP 34S,

1 ENTER +
RCL+ L
RCL+ L
...

About the same:

1 = = preanswer + answer = ...

but on a non-programmable $13 calculator!

Various methods for various machines have been posted in this thread, but the Casio wins the "keystroke efficiency" competition (at least after a few iterations). As Don shows above, the Fibonacci Sequence has a 7 keystroke setup (including one shift key), and each iteration takes only 1 keystroke. Other sequences are similar:

Pell Sequence:
Setup: 0, =, 1, =, 2, Ans, +, ALPHA, PreAns (9 keystrokes)
Iterate: = (1 keystroke)
--> 2, 5, 12, 29, 70, 169, ... (up to the 32nd Pell number, after which it flips into scientific notation and loses digits).

Also, Casio has long supported multiple statements in one line (separated by a colon), which lets you execute an entire sequence of commands repeatedly, by simply by pressing the = key repeatedly. Very cool. Do any non-Casio algebraic calculators do this?