A single number, such as 192113152021235, does not define a sequence.
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The next number in the sequence would be 8. The sequence alternates between numbers from 1 to 5, and then increases by 7. Therefore, the pattern continues with the next number being 8.
One possibility is that the sequence continues: 46, 94, 190, ... The difference between the given terms is 3, 6, 12; so the sequence continues by doubling the previous difference: 24, 48, 96, ... and adding it to the previous number.
I'm guessing your sequence is 1, 3, 6, 10, 15, ... In which case it continues: 21, 28, 36, 45, 55, 66, ... (These are the triangular numbers.)
The sequence of differences between consecutive numbers is 9, 1, -20, 9, 1. If this continues then the next difference is -20 and therefore the seventh number is -5. (15 - 20).
I assume you mean that the sequence continues this way. No, it is not. To be rational, the same pattern - excatly the same sequence of digits - must repeat over and over, since any fraction (i.e., rational number) converted to decimal has this type of pattern.
Rational numbers are those decimals which either terminate or end in a repeating sequence of 1 or more digits. Assuming the number continues with an extra 0 before the next 8 each time then the number neither terminates nor ends in a sequence of repeating digits, thus it is not a rational number.