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A069838
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Let M_n be the n X n matrix M_(i,j)=1 if i^2+j^2 is squarefree, M_(i,j)=0 otherwise; sequence gives values of n such that det(M_n)=0.
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0
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6, 7, 8, 9, 10, 12, 13, 14, 15, 16, 20, 23, 27, 29, 30, 31, 32, 34, 35, 36, 37, 38, 39, 46, 47, 48, 49, 50, 57, 58, 59, 65, 66, 67, 68, 69, 70, 71
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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PROG
| (PARI) for(n=1, 71, if(matdet(matrix(n, n, i, j, issquarefree(i^2+j^2)))==0, print1(n", ")))
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CROSSREFS
| Sequence in context: A162786 A051053 A178868 * A067901 A115840 A058368
Adjacent sequences: A069835 A069836 A069837 * A069839 A069840 A069841
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KEYWORD
| easy,nonn
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2002
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