OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..10000
PROG
(PARI) {m=35000; for(n=1, m, M=matrix(3, 3, i, j, prime(n+3*(i-1)+j-1)); if(matdet(M, 1)==0, print1(n, ", ")))}
(Python)
from sympy import nextprime, Matrix
k, A117345_list, plist = 1, [], [2, 3, 5, 7, 11, 13, 17, 19, 23]
while k < 10**7:
if Matrix(plist).reshape(3, 3).det() == 0:
A117345_list.append(k)
k, plist = k+1, plist[1:]+[nextprime(plist[-1])] # Chai Wah Wu, Jan 25 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Cino Hilliard, Apr 24 2006
EXTENSIONS
Edited by Klaus Brockhaus, Apr 28 2006
STATUS
approved