OFFSET
1,1
COMMENTS
LINKS
Rick Mabry and Laura McCormick, Square products of punctured sequences of factorials, Gaz. Aust. Math. Soc., 2009, pages 346-352 (FFF 2. (3) p. 348).
EXAMPLE
PROG
(PARI) isok(m) = my(x=(m+2)/4, y); issquare(x, &y) && (denominator(y)==1) && !issquare(2*x+1); \\ Michel Marcus, Nov 22 2021
CROSSREFS
KEYWORD
nonn
AUTHOR
Bernard Schott, Nov 21 2021
STATUS
approved