Let us use the first 3 digits of PI, i.e.
3,1,4 to create numbers from 1 to 50, using only basic math. operators.
Not all the digits must be used, but none can be repeated.
Examples (out of this range):
52= 13*4; 65=4^3+1; 84=14*3!
Only few numbers cannot be achieved.
Please show your list.
From the examples, an inference is made that exponents and factorials are to be considered basic math operators, though these two type of operators are not considered by some experts to be basic. Concatenation of the numerals to represent numbers, preoperation*, also appears to be permitted. (An assumption is made that postoperation* concatenation is not permitted).
Besides concatenation, and limited to arithmetic operations  addition, subtraction, multiplication, division  with the additional operations of exponentiation and factorials I was able to find solutions for all but six numbers (32, 39, 45, 46, 49, 50). Many of the numbers have more than one solution, yet I have only listed one for each:
1) 1
2) 3  1
3) 3
4) 4
5) 4 + 1
6) 3 + 4  1
7) 3 + 4
8) 3 + 4 + 1
9) 3! + 4  1
10) 3! + 4
11) 3! + 4 + 1
12) 3 × 4
13) 13
14) 14
15) (4 + 1) × 3
16) 4 × (3 + 1)
17) 13 + 4
18) 4!  3!
19) 4!  3! + 1
20) 4!  3  1
21) 4!  3
22) 4!  3 + 1
23) 4!  1
24) 4!
25) 4! + 1
26) 4! + 3  1
27) 4! + 3
28) 4! + 3 + 1
29) 4! + 3!  1
30) 4! + 3!
31) 4! + 3! + 1
32) ?
33) 34  1
34) 34
35) 34 + 1
36) (4  1)! × 3!
37) 4! + 13
38) 41  3
39) ?
40) (4 + 1)! ÷ 3
41) 41
42) 43  1
43) 43
44) 43 + 1
45) ?
46) ?
47) 41 + 3!
48) 4! + (3 + 1)!
49) ?
50) ?
*Operation is defined here as one of the binary mathematical operations: a + b, a  b, a × b, a ÷ b, a^b; or the unary operation: a!. As an operation, concatenation may be considered a string operation, though strings of numerals are yet often considered numbers  as understood in this problem.
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Solutions for the six numbers where the "basic" operations were not found, yet  though limited to the implied "given" mathematical operator symbols  using the "nonbasic" operations subfactorial { !a } and multifactorials { a!!, a!!!! } in addition to the "basic" operations:
32 = (!3)^(4 + 1)
39 = 4! + (3!  1)!!
45 = !(4 + 1) + !(!3)
46 = !(4 + 1) + !3
49 = ((3!)!!!! × 4) + 1
50 = !(4 + 1) + 3!
Edited on December 28, 2015, 9:00 am

Posted by Dej Mar
on 20151227 13:07:04 