Answer in 5 . 4 . 3 . 2 . 1 .....

[Batalov]

Originally Posted by Batalov

I can represent a (reasonably) large prime with these digits and only one sign symbol :-)
54³² + 1 = 27327525884414205519790497974303154461449992065060438017

I think I can do a bit better with a few more signs
(5!^4)^32+1 is 267-digit prime!

[petrw1]

Originally Posted by rogue

Maybe that was wrong. I'm trying to find it. Possibly it was six sixes not three sixes. I'm sure that someone else here will remember.

I have not heard of 6's

I am well familiar with the four 4's and the four 9's puzzles.

I posted them in this forum several years ago.

[Batalov]

In USSR, in December issues of the "Science and Life" magazine in the math column (or on the back cover), the e.g. "1985 puzzle" (or whatever the next year was) was usually announced and people snail-mailed their long lists. Similar rules, but iirc with factorial and exponentiation, so one could go up to 100 and frequently beyond...

[petrw1]

Originally Posted by Batalov

In USSR, in December issues of the "Science and Life" magazine in the math column (or on the back cover), the e.g. "1985 puzzle" (or whatever the next year was) was usually announced and people snail-mailed their long lists. Similar rules, but iirc with factorial and exponentiation, so one could go up to 100 and frequently beyond...

Somewhere I have solutions for 4's and 9's up to 100....might even be posted here several years ago.

[LaurV]

Originally Posted by science_man_88

nope 121= 5*4*3*2+1 = 120+1

Originally Posted by xilman

Well spotted!

Nope. The highest number is 54321
(edit: and, in the script you say you are tempted to put together, give the possibility of a void operation, which will account as digit concatenation, and also allow the evaluation to be done in ANY order possible, which will account for parenthesis)
(edit2: you are totally right about zero, we have to include it!)