Answer :
The series 1, 13, 19, 127, 181, 1243, 1729 can be represented in sigma notation as Σ aₙ, where aₙ is a sequence of terms.
To represent the given series in sigma notation, we need to identify the pattern or rule that generates each term. Looking at the terms, we can observe that each term is obtained by raising a prime number to a power and subtracting 1. For example, 13 = 2² - 1, 19 = 3² - 1, 127 = 7³ - 1, and so on.
Therefore, we can write the series in sigma notation as Σ (pₙᵏ - 1), where pₙ represents the nth prime number and k represents the exponent.
In this case, we have the terms 1, 13, 19, 127, 181, 1243, 1729, so the sigma notation for the series would be Σ (pₙᵏ - 1), where n ranges from 1 to 7.
Please note that the specific values of pₙ and k need to be determined based on the prime number sequence and the exponent pattern observed in the given series.
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