cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A101815 Positions in the decimal places of Pi where the string of digits 0123456789 appears.

Original entry on oeis.org

17387594880, 26852899245, 30243957439, 34549153953, 41952536161, 43289964000
Offset: 0

Views

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Dec 17 2004

Keywords

Examples

			The string 0123456789 does not appear in the decimal places of Pi before the set of 10 digits beginning at position 17387594880.

Links

Crossrefs

Cf. A101816 for positions of 9876543210 in Pi decimal places.

A329368 Partition the decimal expansion of Pi into non-overlapping strings of length 10: 3141592653, 5897932384,..; a(n) is the position of the strings where digits are different from each other.

Original entry on oeis.org

7, 548, 3113, 11665, 11728, 14305, 15762, 19177, 23288, 28259, 35603, 37613, 40595, 40740, 41477, 52108, 54085, 54367, 62272, 74856, 75082, 75178, 82919, 83591, 92284, 94936, 103849, 105419, 105832, 108875, 111962, 115152, 117919, 118976, 121112, 124121, 128505
Offset: 1

Views

Author

XU Pingya, Apr 27 2020

Keywords

Examples

			a(1) = 7, because such a string first occur at the 7th string: 4592307816 (i.e., 61-70 digits of Pi).

References

  • David Blatner, The Joy of Pi, Walker and Co., NY, 1997; page 91.

Links

  • Eric Weisstein's World of Mathematics, Pi Digits

Crossrefs

Cf. A000796, A014976, A050278, A096760, A101815, A101816, A107115.

Programs

  • Mathematica
    q[i_]:=q[i]=Take[RealDigits[Pi,10,10i][[1]],-10];
a={}; Do[If[Length@Union@q[i]==10, AppendTo[a,i]], {i,130000}]
a
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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