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 1-5 of 5 results.

A080808 a(1) = 4, a(n)= smallest n-th power obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

4, 49, 4096, 3748096, 4932784804069376, 44934932784038660743085694310776796224
Offset: 1

Views

Author

Amarnath Murthy, Mar 22 2003

Keywords

Comments

a(7) > 10^49. A simple heuristic argument suggests that a(7) has > .999 probability of having between 88 and 99 digits. - David Wasserman, Dec 28 2007

Crossrefs

Formula

a(n) = A097661(n)^n.

Extensions

More terms from Ray G. Opao, Sep 20 2004

A080809 a(1) = 6; thereafter, a(n)= smallest n-th power obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

6, 16, 216, 2085136, 62019685191371643, 82626753081964483505319130781618465733184
Offset: 1

Views

Author

Amarnath Murthy, Mar 22 2003

Keywords

Crossrefs

Programs

  • Maple
    buffedStr := proc(n,candid) local f ; if length(n) = 0 then RETURN(true) ; fi ; f := SearchText(substring(n,1),candid) ; if f = 0 then RETURN(false) ; else if buffedStr(substring(n,2..-1),substring(candid,f+1..-1)) = true then RETURN(true) ; else RETURN(false) ; fi ; fi ; end: A080809 := proc(preva,n) local i,tst ; i := 1 ; while true do tst := i^n; if buffedStr(convert(preva,string),convert(tst,string)) = true then RETURN(tst) ; fi ; i := i+1 ; od: end: an :=6 ; for n from 2 to 15 do an := A080809(an,n) ; end ; # R. J. Mathar, Sep 20 2006

Formula

a(n)=A080514(n), n>1. - R. J. Mathar, Sep 18 2008

Extensions

More terms from R. J. Mathar, Sep 20 2006
Copied a term from A080514. - Sean A. Irvine, Sep 01 2009

A080810 a(1) = 7, a(n)= smallest n-th power obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

7, 576, 17576, 1475789056, 1420778345789277056227207, 149247077443060991182553045537892735703095362592472033442634721
Offset: 1

Views

Author

Amarnath Murthy, Mar 22 2003

Keywords

Examples

			24^2=576. 26^3=17576. 196^4=1475789056. 67687^5=1420778345789277056227207.
		

Crossrefs

Programs

  • Maple
    buffedStr := proc(n,candid) local f ; if length(n) = 0 then RETURN(true) ; fi ; f := SearchText(substring(n,1),candid) ; if f = 0 then RETURN(false) ; else if buffedStr(substring(n,2..-1),substring(candid,f+1..-1)) = true then RETURN(true) ; else RETURN(false) ; fi ; fi ; end: A080810 := proc(preva,n) local i,tst ; i := 1 ; while true do tst := i^n ; if buffedStr(convert(preva,string),convert(tst,string)) = true then RETURN(tst) ; fi ; i := i+1 ; od: end: an :=7 ; for n from 2 to 15 do an := A080810(an,n) ; end ; # R. J. Mathar, Sep 20 2006

Extensions

Corrected and extended by R. J. Mathar, Sep 20 2006
One more term. Sean A. Irvine, Sep 01 2009

A080812 a(1) = 9, a(n)= smallest n-th power obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

9, 49, 4096, 3748096, 4932784804069376, 44934932784038660743085694310776796224
Offset: 1

Views

Author

Amarnath Murthy, Mar 22 2003

Keywords

Comments

Essentially the same as A080808.

Crossrefs

Extensions

3 more terms from Sean A. Irvine, Sep 06 2009

A080807 a(1) = 3, a(n)= smallest n-th power obtained by inserting digits anywhere in a(n-1).

Original entry on oeis.org

3, 36, 32768, 20632736881, 2096638274713626813358181376, 2095266319949834829710838437415365780027681350359080101817236461769
Offset: 1

Views

Author

Amarnath Murthy, Mar 22 2003

Keywords

Comments

Next term is > 3*10^43. - David Wasserman, May 14 2004

Crossrefs

Extensions

One more term from Sean A. Irvine, Sep 01 2009
Showing 1-5 of 5 results.