A337146 Numbers k such that abs(A337145(k))/8 is prime.

1, 13, 41, 50, 53, 62, 67, 76, 89, 98, 108, 113, 137, 180, 211, 225, 236, 240, 250, 281, 293, 300, 303, 308, 355, 362, 384, 392, 393, 400, 414, 425, 434, 458, 468, 477, 489, 525, 588, 589, 593, 625, 653, 662, 664, 671, 673, 674, 696, 698, 732, 758, 765, 795, 800, 819, 831, 851, 880, 916, 933, 938

Offset: 1

Author

J. M. Bergot and Robert Israel, Jan 27 2021

Keywords

• nonn

Examples

			a(3) = 41 is a term because A337145(41) = det(1097, 883; 877, 967) = 286408 = 8*35801 and 35801 is prime.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A335593, A337145, A337147.

Programs

Maple

R:= NULL:
count:= 0:
L:= [-7, -5, -3, -1]:
for k from 1 while count < 100 do
  for i from 1 to 4 do
   for x from L[i]+8 by 8 do until isprime(x);
   L[i]:= x;
  od;
  v:= abs(L[1]*L[4]-L[2]*L[3])/8;
  if isprime(v) then count:= count+1; R:= R, k; fi
od:
R;