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A140755 Square array read by rows: T(n,k) = 41*n^2 + k^2 + n*k, with 20 columns. 5
43, 47, 53, 61, 71, 83, 97, 113, 131, 151, 173, 197, 223, 251, 281, 313, 347, 383, 421, 461, 167, 172, 179, 188, 199, 212, 227, 244, 263, 284, 307, 332, 359, 388, 419, 452, 487, 524, 563, 604, 373, 379, 387, 397, 409, 423, 439 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The original definition of this sequence was obscure: "A prime array is embedded in a binary quadratic equation that is a transform of x^2 - x + 41".
LINKS
MATHEMATICA
With[{m=20}, Table[41*n^2 +k^2 +n*k, {n, m}, {k, m}]//Flatten (* G. C. Greubel, Oct 21 2023 *)
PROG
(Magma) m:=20; [41*n^2 +k^2 +n*k: k in [1..m], n in [1..m]]; // G. C. Greubel, Oct 21 2023
(SageMath) flatten([[41*n^2+k^2+n*k for k in range(1, 21)] for n in range(1, 21)]) # G. C. Greubel, Oct 21 2023
CROSSREFS
Cf. A140340, A140754 (very similar arrays).
Sequence in context: A095503 A095495 A095487 * A095479 A156783 A273595
KEYWORD
nonn,tabf,easy,less
AUTHOR
Aldrich Stevens (aldrichstevens(AT)msn.com), May 27 2008
EXTENSIONS
Partially edited with better definition by Omar E. Pol, Jan 11 2009
More terms from Omar E. Pol, Jan 11 2009
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)