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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

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: A217113 A042679 A209194 * A222564 A099134 A069152

Adjacent sequences:  A097229 A097230 A097231 * A097233 A097234 A097235

KEYWORD

nonn

AUTHOR

Chuck Seggelin (seqfan(AT)plastereddragon.com), Jul 31 2004

STATUS

approved

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Last modified July 2 16:14 EDT 2020. Contains 335404 sequences. (Running on oeis4.)