STATUS
proposed
approved
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Revision History for A117345
(Bold, blue-underlined text is an addition; faded, red-underlined text is aShowing entries 1-10 | older changes
Indices n such that the 3 X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.
(history; published version)
(history; published version)
STATUS
editing
proposed
LINKS
Chai Wah Wu, <a href="/A117345/b117345.txt">Table of n, a(n) for n = 1..10000</a>
PROG
k, plist = k+1, plist[1:]+[nextprime(plist[-1])] # Chai Wah Wu, Jan 25 2021
PROG
(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
STATUS
approved
editing
STATUS
proposed
approved
STATUS
editing
proposed
NAME
Indices n such that the 3 by X 3 matrix with components (row by row) prime(n+k), 0 <= k <= 8, has zero determinant.
STATUS
approved
editing
AUTHOR
_Cino Hilliard (hillcino368(AT)gmail.com), _, Apr 24 2006
EXTENSIONS
Edited by _Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), _, Apr 28 2006