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A302445
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Triangle read by rows: row n gives primes of form k^2 + n - k for 0 < k < n.
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2
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2, 3, 5, 5, 7, 11, 17, 7, 13, 19, 37, 11, 29, 11, 13, 17, 23, 31, 41, 53, 67, 83, 101, 13, 19, 43, 103, 17, 71, 197, 17, 19, 23, 29, 37, 47, 59, 73, 89, 107, 127, 149, 173, 199, 227, 257, 19, 31, 61, 109, 151, 229, 23, 41, 131, 293, 401, 23, 29, 43, 53, 79, 113, 179, 233, 263, 443
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OFFSET
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2,1
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LINKS
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EXAMPLE
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n\k| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
---+-----------------------------------------------------------------------
2| 2;
3| 3, 5;
4|
5| 5, 7, 11, 17;
6|
7| 7, , 13, 19, , 37;
8|
9| , 11, , , 29, , , ;
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11| 11, 13, 17, 23, 31, 41, 53, 67, 83, 101;
12|
13| 13, , 19, , , 43, , , , 103, , ;
14|
15| , 17, , , , , , 71, , , , , , 197;
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17| 17, 19, 23, 29, 37, 47, 59, 73, 89, 107, 127, 149, 173, 199, 227, 257;
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MATHEMATICA
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Map[Union@ Select[#, PrimeQ] &, Table[k^2 + n - k, {n, 23}, {k, 0, n}]] // Flatten (* Michael De Vlieger, Apr 10 2018 *)
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PROG
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(GAP) a:=Filtered(Flat(List([1..10], n->List([1..n], k->k^2+n-k))), IsPrime); # Muniru A Asiru, Apr 09 2018
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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