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 A073519 The set of nine consecutive primes forming a 3 X 3 magic square with the smallest magic constant (4440084513). 20
 1480028129, 1480028141, 1480028153, 1480028159, 1480028171, 1480028183, 1480028189, 1480028201, 1480028213 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The square is given (with the terms in correct order) in A320873. The (increasingly ordered) set of primes does not contain more information than the magic constant (= sum) S, since they have to be consecutive and sum up to 3*S. It is easy to construct the unique set of (consecutive) primes with this property, cf. PROGRAM. - M. F. Hasler, Oct 28 2018 REFERENCES H. L. Nelson, Journal of Recreational Mathematics, 1988, vol. 20:3, p. 214. Clifford A. Pickover, The Zen of Magic Squares, Circles and Stars: An Exhibition of Surprising Structures across Dimensions, Princeton University Press, 2002. LINKS Table of n, a(n) for n=1..9. Harvey D. Heinz, Prime Numbers Magic Squares: Minimum consecutive primes - 3, 1999-2010. Index entries for sequences related to magic squares EXAMPLE The magic square is [ 1480028201 1480028129 1480028183 ] [ 1480028153 1480028171 1480028189 ] [ 1480028159 1480028213 1480028141 ] PROG (PARI) A073519=MagicPrimes(4440084513, 3) \\ where: (also used in A073521, ...) MagicPrimes(S, n, P=[nextprime(S\n)])={S=n*S-P[1]; for(i=1, -1+n*=n, S-=if(S>(n-i)*P[1], P=concat(P, nextprime(P[#P]+1)); P[#P], P=concat(precprime(P[1]-1), P); P[1])); if(S, -P, P)} \\ The vector of n^2 primes whose sum is n*S, or a negative vector with an approximate solution if no exact solution exists. - M. F. Hasler, Oct 22 2018 CROSSREFS Cf. A024351, A073520, A073521, A073522, A073523, A256891, A265139, A265614. Sequence in context: A372106 A048051 A345337 * A256891 A320873 A166113 Adjacent sequences: A073516 A073517 A073518 * A073520 A073521 A073522 KEYWORD nonn,fini,full AUTHOR N. J. A. Sloane, Aug 29 2002 STATUS approved

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Last modified September 9 21:06 EDT 2024. Contains 375765 sequences. (Running on oeis4.)