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 1-3 of 3 results.

A139260 Decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma truncated to n places.

Original entry on oeis.org

5, 57, 577, 5772, 57721, 577215, 5772156, 57721566, 577215664, 5772156649, 57721566490, 577215664901, 5772156649015, 57721566490153, 577215664901532, 5772156649015328, 57721566490153286, 577215664901532860
Offset: 1

Views

Author

Omar E. Pol, May 01 2008

Keywords

Examples

			n ... Successive digits of a(n)
1 ............ ( 5 )
2 ......... . ( 5 7 )
3 .......... ( 5 7 7 )
4 ......... ( 5 7 7 2 )
5 ........ ( 5 7 7 2 1 )
6 ....... ( 5 7 7 2 1 5 )
7 ...... ( 5 7 7 2 1 5 6 )
8 ..... ( 5 7 7 2 1 5 6 6 )
9 .... ( 5 7 7 2 1 5 6 6 4 )
10 .. ( 5 7 7 2 1 5 6 6 4 9 )

Links

Crossrefs

Decimal expansion of gamma: A001620. Cf. A011543, A011545 A011551, A139258, A139259, A139261.

Programs

  • Mathematica
    With[{em=RealDigits[EulerGamma,10,20][[1]]},Table[FromDigits[Take[ em,n]], {n,20}]] (* Harvey P. Dale, Nov 22 2011 *)

A139258 Palindromes formed from the reflected decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma.

Original entry on oeis.org

5, 55, 575, 5775, 57775, 577775, 5772775, 57722775, 577212775, 5772112775, 57721512775, 577215512775, 5772156512775, 57721566512775, 577215666512775, 5772156666512775, 57721566466512775, 577215664466512775
Offset: 1

Views

Author

Omar E. Pol, May 01 2008

Keywords

Examples

			n ... Successive digits of a(n)
1 ............ ( 5 )
2 ......... . ( 5 5 )
3 .......... ( 5 7 5 )
4 ......... ( 5 7 7 5 )
5 ........ ( 5 7 7 7 5 )
6 ....... ( 5 7 7 7 7 5 )
7 ...... ( 5 7 7 2 7 7 5 )
8 ..... ( 5 7 7 2 2 7 7 5 )
9 .... ( 5 7 7 2 1 2 7 7 5 )
10 .. ( 5 7 7 2 1 1 2 7 7 5 )

Crossrefs

Decimal expansion of gamma: A001620. Cf. A135634, A135697, A135700, A139259, A139260, A139261.

Programs

  • Mathematica
    a[n_]:=FromDigits[Join[RealDigits[EulerGamma,10,Ceiling[n/2]][[1]],Reverse[RealDigits[EulerGamma,10,Floor[n/2]][[1]]]]];Array[a,18] (* James C. McMahon, Jun 29 2025 *)

A139259 Triangle read by rows: row n lists the digits of A139258(n), the palindromic number formed from the reflected decimal expansion of Euler's constant (or Euler-Mascheroni constant) gamma.

Original entry on oeis.org

5, 5, 5, 5, 7, 5, 5, 7, 7, 5, 5, 7, 7, 7, 5, 5, 7, 7, 7, 7, 5, 5, 7, 7, 2, 7, 7, 5, 5, 7, 7, 2, 2, 7, 7, 5, 5, 7, 7, 2, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 5, 1, 2, 7, 7, 5, 5, 7, 7, 2, 1, 5, 5, 1, 2, 7, 7, 5
Offset: 1

Views

Author

Omar E. Pol, May 01 2008

Keywords

Comments

Also, successive digits of A139258.

Examples

			Triangle begins:
....... 5
...... 5,5
..... 5,7,5
.... 5,7,7,5
... 5,7,7,7,5

Crossrefs

Decimal expansion of gamma: A001620.
Cf. A138068, A138070, A138072, A139258, A139260, A139261.

Programs

  • Mathematica
    a[n_]:=FromDigits[Join[RealDigits[EulerGamma,10,Ceiling[n/2]][[1]],Reverse[RealDigits[EulerGamma,10,Floor[n/2]][[1]]]]];IntegerDigits/@Array[a,12]//Flatten (* James C. McMahon, Jun 29 2025 *)
Showing 1-3 of 3 results.

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

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