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 22 results. Next

A082697 Numbers k such that (4*10^(k-1) - 7)/3 is a plateau prime.

Original entry on oeis.org

3, 5, 7, 95, 161, 361, 1471, 2899, 3095, 3113, 15699, 17957, 42263, 111033
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=7 -> (4*10^(7-1) - 7)/3 = 1333331.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A056244, A068645, A082698-A082720.

Formula

a(n) = A056244(n+1) + 2.

Extensions

a(13)=42263 from Patrick De Geest, Oct 03 2004
a(14)=111033 from Ray Chandler, Apr 14 2011
Edited by Ray Chandler, Nov 04 2014

A082700 Numbers k such that (15*10^(k-1) - 51)/9 is a plateau prime.

Original entry on oeis.org

5, 13, 17, 19, 37, 53, 73, 101, 6233, 24029, 40223, 66395
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=13 -> (15*10^(13-1) - 51)/9 = 1666666666661.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A056247, A068647, A082697-A082720.

Programs

  • PARI
    is(n)=ispseudoprime(2*(10^n-1)/3-5*(10^(n-1)+1)) || ispseudoprime(15*10^(n-1)-51)/9 \\ Charles R Greathouse IV, Feb 07 2013

Formula

a(n) = A056247(n+1) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 04 2014

A082703 Numbers k such that (18*10^(k-1) - 81)/9 is a plateau prime.

Original entry on oeis.org

3, 5, 9, 41, 87, 201, 731, 1461, 23673, 28631
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=9 -> (18*10^(9-1) - 81)/9 = 199999991.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056250, A068649.

Formula

a(n) = A056250(n+1) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 04 2014

A082698 Numbers k such that (13*10^(k-1) - 31)/9 is a plateau prime.

Original entry on oeis.org

7, 67, 1255, 8407, 67039
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.
a(6) > 2*10^5. - Tyler Busby, Feb 02 2023

Examples

			k=7 -> (13*10^(7-1) - 31)/9 = 1444441.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A056245, A082697-A082720.

Formula

a(n) = A056245(n+1) + 2.

Extensions

A new PRP term from Serge Batalov, Nov 02 2008
Edited by Ray Chandler, Nov 04 2014

A082699 Numbers k such that (14*10^(k-1) - 41)/9 is a plateau prime.

Original entry on oeis.org

3, 5, 21, 33, 401, 563, 7017, 37685
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=21 -> (14*10^(21-1) - 41)/9 = 155555555555555555551.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A056246, A068646, A082697-A082720.

Formula

a(n) = A056246(n+1) + 2.

Extensions

37685 from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 04 2014

A082702 Numbers k such that (17*10^(k-1) - 71)/9 is a plateau prime.

Original entry on oeis.org

3, 9, 15, 41, 93, 129, 885, 9425, 14769, 19259, 31235
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=15 -> (17*10^(15-1) - 71)/9 = 188888888888881.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056249.

Formula

a(n) = A056249(n+1) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 04 2014

A082704 Numbers k such that (28*10^(k-1) + 17)/9 is a depression prime.

Original entry on oeis.org

3, 13, 15, 31, 105, 127, 343, 601, 9825
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.
a(10) > 2^16. - Lucas A. Brown, Apr 18 2021
a(10) > 2*10^5. - Tyler Busby, Feb 01 2023

Examples

			k=15 -> (28*10^(15-1) + 17)/9 = 311111111111113.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056251, A068650.

Formula

a(n) = A056251(n) + 2.

Extensions

Edited by Ray Chandler, Nov 04 2014

A082705 Numbers k such that (29*10^(k-1) + 7)/9 is a depression prime.

Original entry on oeis.org

7, 9, 895, 1525, 3037, 21157
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=9 -> (29*10^(9-1) + 7)/9 = 322222223.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056252.

Formula

a(n) = A056252(n) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 05 2014

A082718 Numbers k such that (83*10^(k-1) + 61)/9 is a depression prime.

Original entry on oeis.org

3, 7, 13, 111, 3609, 37785
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=13 -> (83*10^(13-1) + 61)/9 = 9222222222229.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056265, A068651.

Formula

a(n) = A056265(n) + 2.

Extensions

37785 from Patrick De Geest, Jun 26 2005
Edited by Ray Chandler, Oct 20 2010
Edited by Ray Chandler, Nov 04 2014

A082701 Numbers k such that (16*10^(k-1) - 61)/9 is a plateau prime.

Original entry on oeis.org

7, 49, 103, 193, 367, 1003, 20365, 37447, 56083
Offset: 1

Views

Author

Patrick De Geest, Apr 13 2003

Keywords

Comments

Prime versus probable prime status and proofs are given in the author's table.

Examples

			k=7 -> (16*10^(7-1) - 61)/9 = 1777771.

References

  • C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.

Links

Crossrefs

Cf. A082697-A082720, A056248.

Formula

a(n) = A056248(n+1) + 2.

Extensions

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
Edited by Ray Chandler, Nov 04 2014
Showing 1-10 of 22 results. Next

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