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Palindromic strobogrammatic sum of the first Cunningham chain of the first kind (2, 5, 11, 23, 47). [Rock]

2^88 + 2^88 + 2^88 + 11^88 is prime. Note that 2*2*2*11 = 88. [Zucker]

The following quotation about primes contains 88 letters: "The obvious mathematical breakthrough would be development of an easy way to factor large prime numbers." -- Bill Gates (1955- ). [Post]