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 A050286 Starting position of the first occurrence of a string of at least n '7's in the decimal expansion of Pi. 12
 13, 559, 1589, 1589, 162248, 399579, 3346228, 24658601, 24658601, 22869046249, 165431035708, 368299898266, 10541103245815, 14793486898235, 46970519777308 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(10) > 2*10^9 according to the SubIdiom.com/pi search engine. - M. F. Hasler, Apr 13 2019 a(11) > 99*10^9. - Giovanni Resta, Oct 02 2019 a(15) > 22*10^12. - Dmitry Petukhov, Jan 27 2020 a(16) > 50*10^12. - Dmitry Petukhov, Oct 30 2021 LINKS Timothy Mullican, 50 trillion digits of pi Peter TrĂ¼b, 22.4 trillion digits of pi Eric Weisstein's World of Mathematics, Pi Digits. FORMULA a(n) = min { A096761(k); k >= n }. - M. F. Hasler, Mar 19 2017 CROSSREFS Cf. A000796: Decimal expansion (or digits) of Pi. First occurrence of n times the same digit: A035117 (n '1's), A050281 (n '2's), A050282, A050283, A050284, A050286, A050287, A048940 (n '9's). First occurrence of exactly n times the same digit: A096755 (exactly n '1's), A096756, A096757, A096758, A096759, A096760, A096761, A096762, A096763 (exactly n '9's), A050279 (exactly n '0's). Cf. A176341 (first occurrence of n). Cf. A121280 = A068987 - 1 (first occurrence of concatenate(1,...,n)). Sequence in context: A282837 A203360 A265503 * A096761 A076461 A168601 Adjacent sequences:  A050283 A050284 A050285 * A050287 A050288 A050289 KEYWORD nonn,base,more AUTHOR EXTENSIONS Edited by M. F. Hasler, Mar 19 2017 a(10) from Giovanni Resta, Oct 02 2019 a(11)-a(13) added by Dmitry Petukhov, Jan 13 2020 a(14) from Dmitry Petukhov, Jan 27 2020 a(15) from Dmitry Petukhov, Oct 30 2021 STATUS approved

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Last modified July 5 14:18 EDT 2022. Contains 355099 sequences. (Running on oeis4.)