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.

A091126 Number of primes of the form 8k+1 less than 10^n.

Original entry on oeis.org

0, 5, 37, 295, 2384, 19552, 165976, 1439970, 12711220, 113758759, 1029502984, 9401951850, 86516283187, 801235071623
Offset: 1

Views

Author

Eric W. Weisstein, Dec 19 2003

Keywords

Comments

Computed by T. D. Noe, Dec 19 2003.

Links

Crossrefs

Cf. A091127, A091128, A091129.

Programs

  • Mathematica
    p = Select[Table[8 i + 1, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)

Extensions

a(10) from Robert G. Wilson v, Dec 22 2003
a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010

A091127 Number of primes of the form 8k+3 less than 10^n.

Original entry on oeis.org

1, 7, 44, 311, 2409, 19653, 166161, 1440544, 12712340, 113763027, 1029511402, 9401994474, 86516411563, 801235467678
Offset: 1

Views

Author

Eric W. Weisstein, Dec 19 2003

Keywords

Comments

Computed by T. D. Noe, Dec 19 2003.

Links

Crossrefs

Cf. A091126, A091128, A091129.

Programs

  • Mathematica
    p = Select[Table[8 i + 3, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)

Extensions

a(10) from Robert G. Wilson v, Dec 22 2003
a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010

A091128 Number of primes of the form 8k+5 less than 10^n.

Original entry on oeis.org

1, 6, 43, 314, 2399, 19623, 166204, 1440534, 12712271, 113764516, 1029517296, 9401972490, 86516425996, 801235712049
Offset: 1

Views

Author

Eric W. Weisstein, Dec 19 2003

Keywords

Comments

Computed by T. D. Noe, Dec 19 2003.

Links

Crossrefs

Cf. A091126, A091127, A091129.

Programs

  • Mathematica
    p = Select[Table[8 i + 5, {i, 0, 10^7}], PrimeQ[#] &]; Table[Count[p, x_ /; x < 10^n], {n, 7}] (* Robert Price, May 28 2019 *)

Extensions

a(10) from Robert G. Wilson v, Dec 22 2003
a(11)-a(14) from Bernhard Helmes (pi(AT)devalco.de), Apr 21 2010

A095012 Number of 8k+7 primes (A007522) in range ]2^n,2^(n+1)].

Original entry on oeis.org

0, 1, 0, 2, 1, 4, 6, 12, 17, 36, 62, 118, 222, 395, 773, 1412, 2699, 5100, 9690, 18384, 35074, 67076, 128446, 246483, 473737, 911126, 1757021, 3390639, 6551367, 12675525, 24545392, 47584301, 92330675, 179318608, 348546687, 678022783, 1319953810, 2571408262
Offset: 1

Views

Author

Antti Karttunen and Labos Elemer, Jun 01 2004

Keywords

Links

Crossrefs

Cf. A007522, A091129, A095009, A095013.

Programs

Formula

a(n) = A095013(n) - A095009(n).

Extensions

a(34)-a(38) from Amiram Eldar, Jun 12 2024
Showing 1-4 of 4 results.

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

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