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.

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A153276 Numbers n >= 0 such that 5*n+6 is not prime.

Original entry on oeis.org

0, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 30, 31, 32, 33, 34, 36, 38, 39, 40, 42, 43, 44, 45, 46, 48, 50, 51, 52, 54, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 84, 86, 87, 88, 89, 90
Offset: 1

Views

Author

Vincenzo Librandi, Dec 22 2008

Keywords

Comments

The odd terms are the integer values of (4*h*k + 2*k + 2*h - 5)/5, where h and k are positive integers. - Vincenzo Librandi, Jan 17 2013
The corresponding composite numbers are 6, 16, 21, 26, 36, 46, 51, 56, 66, 76, 81, 86, 91, 96, 106, 111, 116, 121, ... - Michael B. Porter, Jan 17 2013

Links

Crossrefs

Cf. A081759.

Programs

  • Magma
    [n: n in [0..150] | not IsPrime(5*n + 6)]; // Vincenzo Librandi, Jan 12 2013
  • Mathematica
    Select[Range[0, 200], !PrimeQ[5 # + 6]&] (* Vincenzo Librandi, Jan 12 2013 *)

Extensions

Erroneous comment deleted by N. J. A. Sloane, Jun 23 2010
Corrected by Jon E. Schoenfield, Jun 24 2010

A111226 Numbers n such that 5*n + 12 is prime.

Original entry on oeis.org

1, 5, 7, 11, 17, 19, 23, 25, 29, 31, 37, 43, 49, 53, 59, 61, 65, 67, 71, 77, 89, 91, 95, 107, 109, 113, 115, 119, 121, 127, 133, 143, 149, 155, 157, 163, 169, 173, 175, 179, 185, 187, 191, 193, 197, 215, 217, 221, 235, 241, 245, 253, 257, 259, 263, 271, 283, 287
Offset: 1

Views

Author

Parthasarathy Nambi, Oct 26 2005

Keywords

Examples

			If n=109 then 5*n + 12 = 557 (prime).

Crossrefs

Cf. A024894, A087505, A024897, A081759.

Programs

A111230 Numbers k such that 5*k + 14 is prime.

Original entry on oeis.org

1, 3, 9, 13, 15, 19, 25, 27, 33, 37, 43, 45, 51, 67, 69, 73, 75, 79, 81, 85, 87, 93, 97, 99, 111, 117, 121, 129, 139, 141, 145, 151, 159, 163, 165, 169, 181, 183, 199, 201, 205, 207, 211, 219, 223, 243, 247, 249, 253, 255, 261, 277, 279, 283, 285, 289, 295, 297
Offset: 1

Views

Author

Parthasarathy Nambi, Oct 27 2005

Keywords

Examples

			If k=111 then 5*k + 14 = 569 (prime).

Crossrefs

Cf. A024894, A087505, A024897, A081759.

Programs

Previous Showing 11-13 of 13 results.

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

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