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Table of n, a(n) for n=1..48.
Altering a(9)=321 gives 5 primes: 421, 521, 821, 311 and 331.
Cf. A048853, A050662, A050667.
Sequence in context: A054056 A108112 A007641 * A050667 A288879 A102906
Adjacent sequences: A050653 A050654 A050655 * A050657 A050658 A050659
Patrick De Geest, Jul 15 1999