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A227950
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Number of decimal digits in the increasing sequence of primes obtainable by concatenating successive decrements from some power of 10.
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2
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3, 5, 5, 7, 9, 11, 13, 13, 15, 17, 19, 21, 25, 27, 53, 81, 85, 183, 191, 307, 377, 409, 475, 541, 565, 885, 1065, 1399, 1489, 2653, 4523, 4565, 5773, 7777, 14281
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OFFSET
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1,1
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LINKS
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EXAMPLE
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1000999998997 is one of the primes described and provides a value of 13 in this sequence, with 1000000999999 providing the other (A227949(7) and A227949(8), in opposite order for the purposes of the FORMULA at that sequence (technically)).
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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STATUS
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approved
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