References to A169682

Terms are primes in nondecreasing order; a(n) gives length of n-th run.
2, 2, 3, 3, 5, 5, 5, 7, 7, 7, 11, 11, 11, 11, 11, 13, 13, 13, 13, 13, 17, 17, 17, 17, 1

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