A153041 -id:A153041 - cp's OEIS frontend

A153051 Numbers n>=9 such that 2*n-17 is not a prime.

9, 13, 16, 19, 21, 22, 25, 26, 28, 31, 33, 34, 36, 37, 40, 41, 43, 46, 47, 49, 51, 52, 54, 55, 56, 58, 61, 64, 66, 67, 68, 69, 70, 71, 73, 75, 76, 79, 80, 81, 82, 85, 86, 88, 89, 91, 93, 94, 96, 97, 100, 101, 102, 103, 106, 109, 110, 111, 112, 113, 115, 116, 117, 118, 119

Offset: 1

Vincenzo Librandi, Dec 17 2008

Adding 1 to each entry yields A153041. [From R. J. Mathar, Dec 19 2008]

The terms after a(1) are the values of 2*h*k + k + h + 9, where h and k are positive integers.- Vincenzo Librandi, Jan 19 2013

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Cf. A098605, A163674.

[n: n in [9..150] | not IsPrime(2*n - 17)]; // Vincenzo Librandi, Jan 19 2013

Select[Range[9, 200], !PrimeQ[2 # - 17] &] (* Vincenzo Librandi, Jan 19 2013 *)

57 removed by R. J. Mathar, Dec 19 2008

A155704 Triangle read by rows where T(m,n)=2mn + m + n + 10.

Original entry on oeis.org

14, 17, 22, 20, 27, 34, 23, 32, 41, 50, 26, 37, 48, 59, 70, 29, 42, 55, 68, 81, 94, 32, 47, 62, 77, 92, 107, 122, 35, 52, 69, 86, 103, 120, 137, 154, 38, 57, 76, 95, 114, 133, 152, 171, 190, 41, 62, 83, 104, 125, 146, 167, 188, 209, 230, 44, 67, 90, 113, 136, 159, 182

Offset: 1

Vincenzo Librandi, Jan 25 2009

The numbers 2*T(m,n)-19 = (2*m+1)*(2*n+1) are not prime.

First column: A016789, second column: A016873, third column: A017053, fourth column: A017221. - Vincenzo Librandi, Nov 20 2012

			Triangle begins:
14;
17, 22;
20, 27, 34;
23, 32, 41, 50;
26, 37, 48, 59, 70;
29, 42, 55, 68, 81, 94;
32, 47, 62, 77, 92, 107, 122;
35, 52, 69, 86, 103, 120, 137, 154;
38, 57, 76, 95, 114, 133, 152, 171, 190;
41, 62, 83, 104, 125, 146, 167, 188, 209, 230;

Vincenzo Librandi, Rows n = 1..100, flattened

Cf. A153041, A016789, A016873, A017053, A017221.

[2*n*k + n + k + 10: k in [1..n], n in [1..11]]; // Vincenzo Librandi, Nov 20 2012

t[n_,k_]:=2 n*k + n + k +  10; Table[t[n, k], {n, 15}, {k, n}]//Flatten (* Vincenzo Librandi, Nov 20 2012 *)

A153146 Numbers n such that 2n + 19 and 2n - 19 are prime.

Original entry on oeis.org

11, 12, 21, 24, 30, 39, 45, 54, 60, 66, 96, 105, 126, 129, 144, 156, 165, 189, 201, 210, 219, 234, 240, 261, 264, 291, 294, 306, 336, 360, 369, 396, 420, 429, 450, 474, 486, 495, 501, 516, 525, 534, 555, 591, 606, 639, 651, 654, 690, 714, 726, 735, 756, 765

Offset: 1

Vincenzo Librandi, Dec 19 2008

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Cf. A153041, A097932, A153143.

[n: n in [7..900] | IsPrime(2*n - 19) and IsPrime(2*n + 19)]; // Vincenzo Librandi, Oct 20 2012

Select[Range[7, 4000], PrimeQ[2 # - 19] && PrimeQ[2 # + 19] &] (* Vincenzo Librandi, Oct 20 2012 *)

cp's OEIS Frontend

A153051 Numbers n>=9 such that 2*n-17 is not a prime.

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A155704 Triangle read by rows where T(m,n)=2mn + m + n + 10.

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A153146 Numbers n such that 2n + 19 and 2n - 19 are prime.

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cp's OEIS Frontend

A153051 Numbers n>=9 such that 2*n-17 is not a prime.

Views

Author

Keywords

Comments

Links

Crossrefs

Programs

Magma

Mathematica

Extensions

A155704 Triangle read by rows where T(m,n)=2*m*n + m + n + 10.

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Magma

Mathematica

A153146 Numbers n such that 2*n + 19 and 2*n - 19 are prime.

Views

Author

Keywords

Links

Crossrefs

Programs

Magma

Mathematica

A155704 Triangle read by rows where T(m,n)=2mn + m + n + 10.

A153146 Numbers n such that 2n + 19 and 2n - 19 are prime.