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 A331882 a(n) is the number of digits in the decimal expansion of the fractional part of Pi needed to contain n occurrences of an n-digit substring. 1
 1, 22, 219, 1805, 25499, 168882, 3566679, 29325629 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS EXAMPLE a(1) = 1, because we need 1 digit to have the first 1-digit substring ('1') appearing 1 time; a(2) = 22, because we need 22 digits (1415926535897932384626) to have the first 2-digit substring ('26') appearing 2 times; a(3) is 219, because we need 219 digits (1415....933446) to have the first 3-digit substring ('446') appearing 3 times; and so on. CROSSREFS Cf. A000796, A159345, A331881 (the repeated n-digit substrings). Sequence in context: A224052 A224305 A224369 * A008453 A066573 A290362 Adjacent sequences:  A331879 A331880 A331881 * A331883 A331884 A331885 KEYWORD nonn,base,hard,more AUTHOR Stijn Dierckx, Jan 30 2020 STATUS approved

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Last modified June 17 12:26 EDT 2021. Contains 345080 sequences. (Running on oeis4.)