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 1-4 of 4 results.

A133069 Successive digits of twin primes A001097.

Original entry on oeis.org

3, 5, 7, 1, 1, 1, 3, 1, 7, 1, 9, 2, 9, 3, 1, 4, 1, 4, 3, 5, 9, 6, 1, 7, 1, 7, 3, 1, 0, 1, 1, 0, 3, 1, 0, 7, 1, 0, 9, 1, 3, 7, 1, 3, 9, 1, 4, 9, 1, 5, 1, 1, 7, 9, 1, 8, 1, 1, 9, 1, 1, 9, 3, 1, 9, 7, 1, 9, 9, 2, 2, 7, 2, 2, 9, 2, 3, 9, 2, 4, 1, 2, 6, 9, 2, 7, 1, 2, 8, 1, 2, 8, 3, 3, 1, 1, 3, 1, 3
Offset: 1

Views

Author

Omar E. Pol, Nov 10 2007

Keywords

Comments

Also, with offset 0, decimal expansion of the constant by concatenate twin primes. Example: 0.35711131719293141435961... Hence, subsequence of A033308. - Omar E. Pol, Oct 21 2017

Crossrefs

Programs

  • Mathematica
    Flatten[IntegerDigits/@Union[Flatten[Select[Partition[Prime[ Range[ 100]],2,1], Last[#]- First[#] == 2&]]]] (* Harvey P. Dale, May 29 2014 *)

A133074 Concatenation of next n isolated primes.

Original entry on oeis.org

2, 2337, 475367, 79838997, 113127131157163, 167173211223233251, 257263277293307317331, 337353359367373379383389, 397401409439443449457467479, 487491499503509541547557563577
Offset: 1

Views

Author

Omar E. Pol, Nov 10 2007

Keywords

Crossrefs

Programs

  • Mathematica
    Module[{ip=Select[Prime[Range[200]],NoneTrue[#+{2,-2},PrimeQ]&],c},c = Floor[ (Sqrt[8 Length[ip]+1]-1)/2];FromDigits[Flatten[IntegerDigits/@#]]&/@TakeList[ ip,Range[c]]] (* Harvey P. Dale, Jun 09 2022 *)

A133060 Concatenation of next n twin primes.

Original entry on oeis.org

3, 57, 111317, 19293141, 4359617173, 101103107109137139, 149151179181191193197, 199227229239241269271281, 283311313347349419421431433, 461463521523569571599601617619
Offset: 1

Views

Author

Omar E. Pol, Nov 10 2007

Keywords

Crossrefs

Programs

  • Mathematica
    Module[{pp=200,tps},tps=Union[Flatten[Select[Partition[Prime[Range[ pp]],2,1],#[[2]]-#[[1]]==2&]]];FromDigits[Flatten[ IntegerDigits/@#]]&/@ TakeList[tps,Range[Floor[(Sqrt[1+8Length[tps]]-1)/2]]]] (* Harvey P. Dale, Apr 06 2022 *)

A134729 Concatenation of next n Sophie Germain primes A005384(n).

Original entry on oeis.org

2, 35, 112329, 41538389, 113131173179191, 233239251281293359, 419431443491509593641, 653659683719743761809911, 95310131019103110491103122312291289, 1409143914511481149915111559158316011733, 18111889190119311973200320392063206921292141
Offset: 1

Views

Author

Omar E. Pol, Nov 10 2007

Keywords

Crossrefs

Programs

  • Mathematica
    With[{sgp=Select[Prime[Range[500]],PrimeQ[2#+1]&]},Table[ FromDigits[ Flatten[IntegerDigits/@Take[sgp,{(n(n+1))/2+1,((n+1)(n+2))/2}]]],{n,0,11}]] (* Harvey P. Dale, Mar 24 2013 *)

Extensions

More terms from Harvey P. Dale, Mar 24 2013
Showing 1-4 of 4 results.