1,1
a(2)=607 because the first 607 digits of Pi contain every conceivable 2-digit subsequence but the first 606 digits do not. The combination (6, 8) appears as 606th and 607th term in A000796.
Cf. A000796.
Sequence in context: A010949 A126923 A010985 this_sequence A076684 A004328 A094760
Adjacent sequences: A080594 A080595 A080596 this_sequence A080598 A080599 A080600
more,nonn,base
Martin Hasch (martin(AT)mathematik.uni-ulm.de), Feb 23 2003
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