OFFSET
60,1
LINKS
Eric Weisstein's World of Mathematics, Prime Magic Square.
EXAMPLE
[17, 11, 31, 61]
[43, 67, 3, 7]
[41, 37, 13, 29]
[19, 5, 73, 23]
is a 4 X 4 prime magic square in which the elements in each row and column and both diagonals sum to 120 and all elements are prime numbers. There are a total of 128 such prime magic squares so a(60)=128.
CROSSREFS
KEYWORD
nonn
AUTHOR
Zhao Hui Du, Jan 02 2024
STATUS
approved