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 A335592 a(n) is the determinant of the 2 X 2 matrix whose entries (listed by rows) are the n-th prime ending in 1, 3, 7, 9 respectively. 4
 188, 678, 1568, 2798, 2768, 3928, 9328, 9418, 16918, 12418, 19428, 19578, 16898, 34698, 28028, 30988, 35878, 58528, 53908, 52318, 54938, 37308, 53098, 49888, 49758, 68688, 65738, 74328, 96558, 100098, 95548, 121898, 119108, 117438, 104078, 140698, 156588, 143168, 222888, 226608, 196448, 160448 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS All terms == 8 (mod 10). Are there negative terms? The first 10^7 are positive. LINKS Robert Israel, Table of n, a(n) for n = 1..10000 EXAMPLE The first primes ending in 1,3,7,9 are 11,3,7,19, so a(1) = 11*19 - 3*7 = 188. The second primes ending in 1,3,7,9 are 31,13,17,29, so a(2) = 31*29 - 13*17 = 678. The third primes ending in 1,3,7,9 are 41,23,37,59, so a(3) = 41*59 - 23*37 = 1568. MAPLE R:= NULL: L:= [-9, -7, -3, -1]: for k from 1 to 100 do for i from 1 to 4 do for x from L[i]+10 by 10 do until isprime(x); L[i]:= x; od; R:= R, L[1]*L[4]-L[2]*L[3]; od: R; CROSSREFS Cf. A335581, A335593, A336738. Sequence in context: A304279 A099945 A211814 * A233786 A233961 A073586 Adjacent sequences: A335589 A335590 A335591 * A335593 A335594 A335595 KEYWORD nonn,base,look AUTHOR J. M. Bergot and Robert Israel, Jan 27 2021 STATUS approved

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Last modified September 22 02:18 EDT 2023. Contains 365503 sequences. (Running on oeis4.)