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.

Previous Showing 11-17 of 17 results.

A099662 a(n) is the least prime following A002282(n) repdigits.

Original entry on oeis.org

2, 11, 89, 907, 8893, 88897, 888917, 8888927, 88888901, 888888901, 8888888891, 88888888901, 888888888919, 8888888888921, 88888888888889, 888888888888907, 8888888888888927, 88888888888888889, 888888888888888947
Offset: 0

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=8: 88 is followed by 89.
		

Crossrefs

Programs

  • Mathematica
    Table[NextPrime[8*(10^n-1)/9], {n, 0, 35}]

A099664 a(n) is the largest prime before A002278(n).

Original entry on oeis.org

3, 43, 443, 4441, 44417, 444443, 4444409, 44444399, 444444443, 4444444429, 44444444441, 444444444443, 4444444444439, 44444444444353, 444444444444421, 4444444444444423, 44444444444444411, 444444444444444419
Offset: 1

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=2: 43 is before 44.
		

Crossrefs

Programs

  • Mathematica
    <Harvey P. Dale, Feb 25 2013 *)

A099657 a(n) is the least prime following A002277(n) repdigits.

Original entry on oeis.org

2, 5, 37, 337, 3343, 33343, 333337, 3333373, 33333347, 333333349, 3333333403, 33333333343, 333333333367, 3333333333347, 33333333333437, 333333333333389, 3333333333333343, 33333333333333391, 333333333333333391
Offset: 0

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=3: 33 is followed by 37.
		

Crossrefs

Programs

  • Mathematica
    Table[NextPrime[3*(10^n-1)/9], {n, 0, 35}]

A099661 a(n) is the least prime following A002281(n) repdigits.

Original entry on oeis.org

2, 11, 79, 787, 7789, 77783, 777781, 7777801, 77777803, 777777799, 7777777781, 77777777827, 777777777841, 7777777777859, 77777777777837, 777777777777787, 7777777777777867, 77777777777777797, 777777777777777817
Offset: 0

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=6: 77 is followed by 79.
		

Crossrefs

Programs

  • Mathematica
    Table[NextPrime[7*(10^n-1)/9], {n, 0, 35}]
    NextPrime/@LinearRecurrence[{11,-10},{0,7},35] (* Harvey P. Dale, Dec 12 2021 *)

A099663 a(n) is the largest prime before A002276(n).

Original entry on oeis.org

19, 211, 2221, 22193, 222199, 2222219, 22222199, 222222193, 2222222137, 22222222189, 222222222169, 2222222222197, 22222222222201, 222222222222151, 2222222222222203, 22222222222222153, 222222222222222221, 2222222222222222177, 22222222222222222169, 222222222222222222149, 2222222222222222222161
Offset: 2

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=2: 19 is before 22.
		

Crossrefs

Programs

  • Mathematica
    Table[NextPrime[2(10^n-1)/9, -1], {n, 2, 35}]
    Drop[NextPrime[#,-1]&/@LinearRecurrence[{11,-10},{0,2},20],2] (* Harvey P. Dale, Dec 19 2020 *)

Formula

a(n) = A007917(A002276(n)). - Michel Marcus, Jun 29 2025

Extensions

More terms from Michel Marcus, Jun 29 2025

A099665 a(n) is the largest prime before A002279(n).

Original entry on oeis.org

3, 53, 547, 5531, 55547, 555523, 5555527, 55555553, 555555541, 5555555519, 55555555543, 555555555551, 5555555555551, 55555555555541, 555555555555529, 5555555555555539, 55555555555555519, 555555555555555487, 5555555555555555533, 55555555555555555483, 555555555555555555491
Offset: 1

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=2: 53 is before 55.
		

Crossrefs

Programs

  • Mathematica
    Table[NextPrime[5*(10^n-1)/9, -1], {n, 1, 35}]
    NextPrime[#,-1]&/@Table[FromDigits[PadRight[{},n,5]],{n,20}] (* Harvey P. Dale, Aug 31 2015 *)

Formula

a(n) = A007917(A002282(n)). - Amiram Eldar, Jun 29 2025

A099666 a[n] is the largest prime before A002280[n] repdigits.

Original entry on oeis.org

5, 61, 661, 6661, 66653, 666649, 6666617, 66666653, 666666653, 6666666661, 66666666643, 666666666619, 6666666666629, 66666666666647, 666666666666647, 6666666666666571, 66666666666666601, 666666666666666661
Offset: 1

Views

Author

Labos Elemer, Nov 17 2004

Keywords

Examples

			n=2: 61 is before 66.
		

Crossrefs

Programs

  • Mathematica
    <
    				
Previous Showing 11-17 of 17 results.