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 1-10 of 13 results. Next

A061359 a(1) = 1; a(n) = least number such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.

Original entry on oeis.org

1, 8, 16, 146, 22086, 31071113326, 365107058344463715696, 2684967738644586785227227090233956040549004, 809079884187716191997158821357206898310718837487307207657194711477350102495950972665
Offset: 1

Views

Author

Amarnath Murthy, Apr 28 2001

Keywords

Examples

			a(3)a(2)a(1) = 1681 = 41^2, a(4)a(3)a(2)a(1) = 1461681 = 1209^2.

Links

Crossrefs

Cf. A050634, A050635.

Extensions

Corrected and extended by Larry Reeves (larryr(AT)acm.org), May 07 2001
More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Nov 06 2001

A050635 a(n+1)^2 is next smallest square ending with a(n)^2, initial term is 1.

Original entry on oeis.org

1, 9, 41, 1209, 469959, 176270001209, 6042408942999999530041, 16385871165869048127200000000000176270001209, 28444329561227422116741433513058707457037799999999999999999999993957591057000000469959
Offset: 1

Views

Author

Patrick De Geest, Jul 15 1999

Keywords

Crossrefs

Cf. A050634, A048558, A050629.

Extensions

More terms from Jonathan Cross (jcross(AT)wcox.com), Oct 09 2001

A065689 a(1) = 0; for n > 1, a(n) is the smallest square > a(n-1) with a(n-1) forming its final digits.

Original entry on oeis.org

0, 100, 8100, 168100, 146168100, 22086146168100, 3107111332622086146168100, 3651070583444637156963107111332622086146168100, 26849677386445867852272270902339560405490043651070583444637156963107111332622086146168100
Offset: 1

Views

Author

Klaus Brockhaus, Nov 17 2001

Keywords

Comments

a(n) = 100*A050634(n-1) for n > 1.

Crossrefs

Cf. A050634, A050635, A061359, A065690, A065691.

A065690 a(1) = 0; for n > 1, a(n) is the square root of the smallest square > a(n-1)^2 with a(n-1)^2 forming its final digits.

Original entry on oeis.org

0, 10, 90, 410, 12090, 4699590, 1762700012090, 60424089429999995300410, 163858711658690481272000000000001762700012090, 284443295612274221167414335130587074570377999999999999999999999939575910570000004699590
Offset: 1

Views

Author

Klaus Brockhaus, Nov 17 2001

Keywords

Comments

a(n) = 10*A050635(n-1) for n > 1; a(n) = sqrt(A065689(n)).

Crossrefs

Cf. A050634, A050635, A061359, A065689, A065691.

A061839 a(n+1) is the smallest square ending with a(n), initial term is 5.

Original entry on oeis.org

5, 25, 225, 1225, 81225, 16281225, 7077116281225, 1642681227077116281225, 228822983661635570881642681227077116281225, 976324672198183536165095004791768497036228822983661635570881642681227077116281225
Offset: 1

Views

Author

Amarnath Murthy, May 29 2001

Keywords

Links

Crossrefs

Cf. A050634, A065689, A065780, A065781, A050636, A050638.

Extensions

Corrected and extended by Frank Ellermann, Jun 04 2001
More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001
Edited by N. J. A. Sloane, Apr 29 2007
First term prepended by Derek Orr, Dec 27 2013

A065691 a(1) = 0; for n > 1, a(n) is the smallest integer > 0 such that the concatenation a(n)a(n-1)...a(2)a(1) is a square.

Original entry on oeis.org

0, 10, 8, 16, 146, 22086, 31071113326, 365107058344463715696, 2684967738644586785227227090233956040549004, 809079884187716191997158821357206898310718837487307207657194711477350102495950972665
Offset: 1

Views

Author

Klaus Brockhaus, Nov 17 2001

Keywords

Comments

a(n) = A061359(n-1) for n > 2.

Crossrefs

Cf. A050634, A050635, A061359, A065689, A065690.

A050628 a(1) = 1; a(n+1) is next smallest nontrivial square containing a(n) as a substring.

Original entry on oeis.org

1, 16, 169, 56169, 36156169, 13361561690409, 42133615616904090751725289
Offset: 1

Views

Author

Patrick De Geest, Jul 15 1999

Keywords

Crossrefs

Cf. A050629, A048557, A050630, A050632, A050634.

Formula

a(n) = A050629(n)^2.

Extensions

a(7) from Max Alekseyev, Feb 15 2012

A065776 a(n+1) is the next smallest square ending with a(n), initial term is 6.

Original entry on oeis.org

6, 16, 2116, 6022116, 99196022116, 20182578299196022116, 78614837323045137420182578299196022116, 22249794767797224323826628055603914578614837323045137420182578299196022116
Offset: 1

Views

Author

Klaus Brockhaus, Nov 19 2001

Keywords

Crossrefs

Cf. A050634, A065689, A065777, A065778.

Extensions

More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001
First term prepended by Derek Orr, Dec 27 2013

A065782 a(1) = 36; for n > 1, a(n) is the smallest square > a(n-1) with a(n-1) forming its final digits.

Original entry on oeis.org

36, 1936, 6031936, 1556366031936, 46157300861556366031936, 896725409027114346157300861556366031936, 56096202719698239565812734781810166896725409027114346157300861556366031936
Offset: 1

Views

Author

Klaus Brockhaus, Nov 19 2001

Keywords

Crossrefs

Cf. A050634, A065689, A065783, A065784.

Extensions

More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001

A065785 a(1) = 49; for n > 1, a(n) is the smallest square > a(n-1) with a(n-1) forming its final digits.

Original entry on oeis.org

49, 1849, 1671849, 24011671849, 408646172724011671849, 14079962896835441528408646172724011671849, 30988070410883251650062468506470600085614079962896835441528408646172724011671849
Offset: 1

Views

Author

Klaus Brockhaus, Nov 19 2001

Keywords

Comments

a(n) = A050638(n+1) for n >= 1.

Crossrefs

Cf. A050634, A050638, A065689, A065786, A065787.
Showing 1-10 of 13 results. Next

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

Content is available under The OEIS End-User License Agreement.