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EXAMPLE
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a(2)=33 because there are 33 primes not greater than 541 (the 100th prime) that contain a 7's digit. Namely: 7, 17, 37, 47, 67, 71, 73, 79, 97, 107, 127, 137, 157, 167, 173, 179, 197, 227, 257, 271, 277, 307, 317, 337, 347, 367, 373, 379, 397, 457, 467, 479, 487.
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