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A111128
Scores for Part 2 of the n X n generalization of the Gordon Lee puzzle.
1
2, 21, 72, 181, 390, 715
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OFFSET
1,1
COMMENTS
See
A109943
and the references therein for more information.
1192 and 1847 are lower bounds for the next terms a(7) and a(8).
LINKS
Table of n, a(n) for n=1..6.
Eric Weisstein's World of Mathematics,
Prime Array.
Al Zimmermann's Programming Contests. Primal Squares:
The Problem
Al Zimmermann's Programming Contests. Primal Squares:
Best grids for part 1 found during the contest.
Al Zimmermann's Programming Contests. Primal Squares:
Part 2 solutions
EXAMPLE
a(2)=21 is the "part 2" score for the matrix
4 7
3 1
which contains two single-digit primes and one even number (score: 2+1)
and 9 2-digit primes: 13,17,31,37,41,43,47,71,73 score(9*2); total = 3+18 = 21.
CROSSREFS
Cf.
A032529
= all primes in the 3 X 3 record matrix,
A034720
= number of candidates to be checked for primality in an n X n matrix of single digits.
Sequence in context:
A075681
A212257
A034520
*
A213827
A129556
A077209
Adjacent sequences:
A111125
A111126
A111127
*
A111129
A111130
A111131
KEYWORD
hard
,
more
,
nonn
AUTHOR
Hugo Pfoertner
, Sep 21 2005
STATUS
approved
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Last modified April 26 21:53 EDT 2024. Contains 372004 sequences. (Running on oeis4.)