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A056221
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Image of primes (A000040) under "little Hankel" transform that sends [c_0, c_1, ...] to [d_0, d_1, ...] where d_n = c_n^2 - c_{n+1}*c_{n-1}.
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3
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-1, 4, -6, 30, -18, 42, -30, -22, 128, -112, 98, 90, -78, -70, 36, 248, -232, 158, 150, -280, 182, -142, -130, 420, 210, -198, 222, -210, -1074, 1326, -238, 560, -1092, 1212, -592, 36, 350, -310, 36, 728, -1428, 1548, -378, 402, -1966, 144, 1832, 462, -450, -442
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n) = determinant of matrix
| prime(n+1) prime(n)|
| prime(n+2) prime(n+1)| - Zak Seidov (zakseidov(AT)yahoo.com), Jul 23 2008, indices corrected by Gary Detlefs, Dec 09 2011
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MAPLE
| A056221 := proc(n)
ithprime(n+1)^2-ithprime(n)*ithprime(n+2) ;
end proc:
seq(A056221(n), n=1..10) ; # R. J. Mathar, Dec 10 2011
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CROSSREFS
| Sequence in context: A122113 A093815 A142859 * A046849 A090530 A154667
Adjacent sequences: A056218 A056219 A056220 * A056222 A056223 A056224
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 06 2000
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