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A097232
Starting primes for which there are no solutions in A097231.
2
2, 23, 83, 157, 181, 211, 223, 227, 229, 233, 239, 251, 283, 311, 331, 347, 353, 359, 367, 421, 431, 433, 439, 443, 461, 463, 467, 503, 521, 541, 547, 557, 577, 587, 593, 599, 601, 619, 631, 641, 647, 677, 683, 691, 701, 709, 719, 727, 733, 797, 809, 811
OFFSET
1,1
FORMULA
a(n) = the n-th starting prime for which there are no solutions in A097231.
EXAMPLE
a(1) = 2 because there is no 3 X 3 square arrangement of the primes 2, 3, 5, 7, 11, 13, 17, 19 and 23 such that all row, column and diagonal totals are primes. a(2) = 23 because there is no 3 X 3 square arrangement of the primes 23, 29, 31, 37, 41, 43, 47, 53 and 59 such that all row, column and diagonal totals are primes.
CROSSREFS
Cf. A097231 (number of distinct solutions for each starting prime), A097233 (starting primes with only one unique solution).
Sequence in context: A354691 A345701 A209194 * A339474 A222564 A099134
KEYWORD
nonn
AUTHOR
Chuck Seggelin (seqfan(AT)plastereddragon.com), Jul 31 2004
STATUS
approved