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A071424
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a(n) = a(n-1) + number of decimal digits of n!. Number of decimal digits of concatenation of first n factorials.
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0
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1, 2, 3, 5, 8, 11, 15, 20, 26, 33, 41, 50, 60, 71, 84, 98, 113, 129, 147, 166, 186, 208, 231, 255, 281, 308, 337, 367, 398, 431, 465, 501, 538, 577, 618, 660, 704, 749, 796, 844, 894, 946, 999, 1054, 1111, 1169, 1229, 1291, 1354, 1419, 1486, 1554, 1624
(list; graph; refs; listen; history; internal format)
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