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Table of n, a(n) for n=1..31.
Select[Range, DigitCount[#, 10, 3]==4&] [From Harvey P. Dale, Feb 02 2011]
Sequence in context: A253538 A147881 A230307 * A251331 A261656 A231955
Adjacent sequences: A043501 A043502 A043503 * A043505 A043506 A043507