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[Voldemar]

(12-05-2017 05:56 PM)salvomic Wrote:  but 128 are better

Not in all cases.
Try this:
((((2*3+4)*2+5)*2+6)*2+7)*2+8=
On HP 35s
2 Enter Enter Enter 3 * 4 + * 5 + * 6 + * 7 + * 8 +
20 keystrokes.
On HP Prime
2 Enter Enter Enter 3 * 4 + * 5 + * 6 + 2 * 7 + 2 * 8 +
22 keystrokes.
or
2 Enter Enter Enter Enter Enter 3 * 4 + * 5 + * 6 + * 7 + * 8 +
22 keystrokes.