That's a list of five consecutive real, rational, natural, positive integers,
that are greater than any number less than 40, and less than any number
greater than 44 .
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10
41 and 43 are prime numbers.
When you have an even number of numbers, you find the median by averaging together the two middle values, in this case 42 and 44. Add the two numbers (42+44=86) and divide by 2 (86/2 = 43).
The numbers are 18, 19, ... to 27 in base 10 expressed as base 5 numbers.
40 = XL 41 = XLI 42 = XLII 43 = XLIII 44 = XLIV 45 = XLV 46 = XLVI 47 = XLVII 48 = XLVIII 49 = XLIX 50 = L