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 1-6 of 6 results.

A271443 Earliest start of a run of n numbers divisible by a cube larger than one.

Original entry on oeis.org

8, 80, 1375, 22624, 18035622, 4379776620, 1204244328624, 2604639091138248, 2604639091138248
Offset: 1

Views

Author

Giovanni Resta, Apr 23 2016

Keywords

Comments

a(5)-a(7) were found by Donovan Johnson.

Examples

			a(9) = 2604639091138248 and the following 8 numbers are divisible by 2^3, 11^3, 5^3, 17^3, 7^3, 13^3, 3^3, 19^3, and 2^4, respectively.
		

Crossrefs

Programs

  • Mathematica
    a[n_] := Block[{k=1, c=0}, While[ c
    				

A330480 Earliest start of a run of n numbers divisible by a fourth power larger than one.

Original entry on oeis.org

16, 80, 33614, 202099373, 40280549372, 430995495889374, 77405340617896874
Offset: 1

Views

Author

Jud McCranie, Dec 16 2019

Keywords

Comments

De Koninck's book says that "most likely" a(7)=77405340617896874.

Examples

			33614 is divisible by 7^4, 33615 is divisible by 3^4, and 33616 is divisible by 2^4.  This is the smallest number with this property, so a(3)=33614.
		

References

  • J.-M. De Koninck, Those Fascinating Numbers, Entry 242, p. 63, Amer. Math. Soc., 2009.

Crossrefs

Extensions

a(7) from Giovanni Resta, Dec 18 2019

A330481 Earliest start of a run of n numbers divisible by a fifth power larger than one.

Original entry on oeis.org

32, 1215, 2590623, 2146909373, 105636978090621, 3269698976575137500
Offset: 1

Views

Author

Jud McCranie, Dec 15 2019

Keywords

Comments

De Koninck's book gives probable a(6) = 3269698976575137500.
a(7) <= 745436945776920355709374. - Giovanni Resta, Dec 19 2019

Examples

			1215 is divisible by 3^5 and 1216 is divisible by 2^5. This is the smallest number with this property, so a(2)=1215.
		

References

  • J.-M. De Koninck, Those Fascinating Numbers, Entry 242, p. 63, Amer. Math. Soc., 2009.

Crossrefs

Extensions

a(6) from Giovanni Resta, Dec 19 2019

A330484 Earliest start of a run of n numbers divisible by a ninth power larger than one.

Original entry on oeis.org

512, 3995648, 2889212890624, 18705093636361328125, 19810215665260426138787109374
Offset: 1

Views

Author

Jud McCranie, Dec 16 2019

Keywords

Comments

a(6) <= 39109788784614310863666299138574218749. - Robert Israel, Jun 02 2020

Examples

			2889212890624 is divisible by 2^9, 2889212890625 is divisible by 5^9, and 2889212890626 is divisible by 3^9. This is the smallest number with this property, so a(3)=2889212890624.
		

Crossrefs

Extensions

a(4)-a(5) from Giovanni Resta, Dec 17 2019

A330485 Earliest start of a run of n numbers divisible by a tenth power larger than one.

Original entry on oeis.org

1024, 24151040, 61938212890624, 9226967798833574218749, 13279660499584033124533574218748
Offset: 1

Views

Author

Jud McCranie, Dec 16 2019

Keywords

Examples

			61938212890624 is divisible by 2^10, 61938212890625 is divisible by 5^10, and 61938212890626 is divisible by 3^10.  This is the smallest number with this property, so a(3)=61938212890624.
		

Crossrefs

Extensions

a(4) from Giovanni Resta, Dec 17 2019
a(5) from Giovanni Resta, Dec 19 2019

A088080 Start of n successive numbers divisible by n-th powers.

Original entry on oeis.org

1, 8, 1375, 202099373, 105636978090621, 283435321166212288109372
Offset: 1

Views

Author

Amarnath Murthy, Sep 22 2003

Keywords

Comments

a(5) <= 105636978090621.

Examples

			a(3)=1375 because 1375=5^3*11, 1376=2^3*172, 1377=3^3*51; all multiples of cubes.
		

Crossrefs

Extensions

Corrected and extended by Don Reble, Sep 27 2003
a(5) from Donovan Johnson, Dec 14 2010
a(6) from Giovanni Resta, Dec 19 2019
Showing 1-6 of 6 results.