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Search: id:A119958
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| A119958 |
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Numerator of determinant of n X n matrix with elements M[i,j] = (p^2 - p + 1)/(p*(p-1)) if i=j and 1 otherwise, where p=Prime[i]. |
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+0
3
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| 3, 7, 147, 301, 33411, 1748509, 36718689, 4198170109, 709490748421, 82402282638039, 1345903949754637, 1564158644309443, 855594778437265321, 5136411178193150947, 3703352459477261832787, 261798531558431048025481
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OFFSET
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1,1
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COMMENT
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All square prime divisors of a(n) {7,13,43,139,19,31,61,37,607,523,67,79,1201,241,1171,157,109,...} belong to A002476[n] Primes of form 6n + 1.
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MATHEMATICA
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Numerator[ Table[ Det[ DiagonalMatrix[ Table[1/(Prime[i]*(Prime[i]-1)), {i, 1, n} ] + 1 ]], {n, 1, 150}]]
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CROSSREFS
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Cf. A002476, A036689, A002061.
Sequence in context: A156521 A012636 A006031 this_sequence A031881 A114789 A128273
Adjacent sequences: A119955 A119956 A119957 this_sequence A119959 A119960 A119961
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 02 2006
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