A153041
Numbers n >=10 such that 2*n-19 is not a prime.
Original entry on oeis.org
10, 14, 17, 20, 22, 23, 26, 27, 29, 32, 34, 35, 37, 38, 41, 42, 44, 47, 48, 50, 52, 53, 55, 56, 57, 59, 62, 65, 67, 68, 69, 70, 71, 72, 74, 76, 77, 80, 81, 82, 83, 86, 87, 89, 90, 92, 94, 95, 97, 98, 101, 102, 103, 104
Offset: 1
A153047
Numbers n such that 2*n-15 is not a prime.
Original entry on oeis.org
12, 15, 18, 20, 21, 24, 25, 27, 30, 32, 33, 35, 36, 39, 40, 42, 45, 46, 48, 50, 51, 53, 54, 55, 57, 60, 63, 65, 66, 67, 68, 69, 70, 72, 74, 75, 78, 79, 80, 81, 84, 85, 87, 88, 90, 92, 93, 95, 96, 99, 100, 101, 102, 105, 108, 109, 110, 111, 112, 114, 115, 116
Offset: 1
A163652
Triangle read by rows where T(n,m)=2*m*n + m + n + 6.
Original entry on oeis.org
10, 13, 18, 16, 23, 30, 19, 28, 37, 46, 22, 33, 44, 55, 66, 25, 38, 51, 64, 77, 90, 28, 43, 58, 73, 88, 103, 118, 31, 48, 65, 82, 99, 116, 133, 150, 34, 53, 72, 91, 110, 129, 148, 167, 186, 37, 58, 79, 100, 121, 142, 163, 184, 205, 226, 40, 63, 86, 109, 132, 155, 178
Offset: 1
Triangle begins:
10;
13, 18;
16, 23, 30;
19, 28, 37, 46;
22, 33, 44, 55, 66;
25, 38, 51, 64, 77, 90;
28, 43, 58, 73, 88, 103, 118;
31, 48, 65, 82, 99, 116, 133, 150;
34, 53, 72, 91, 110, 129, 148, 167, 186;
37, 58, 79, 100, 121, 142, 163, 184, 205, 226;
40, 63, 86, 109, 132, 155, 178, 201, 224, 247, 270;
etc.
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[2*n*k + n + k + 6: k in [1..n], n in [1..11]]; // Vincenzo Librandi, Nov 20 2012
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t[n_,k_]:=2 n*k + n + k + 6; Table[t[n, k], {n, 15}, {k, n}]//Flatten (* Vincenzo Librandi, Nov 20 2012 *)
Showing 1-3 of 3 results.
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