A360210 Indices of squares in A068869.

1, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16

Offset: 1

Author

Alexander R. Povolotsky, Jan 29 2023

Keywords

• nonn
• more

Comments

a(14) > 30000. - Michel Marcus, Jan 30 2023

Examples

			5 is a term because A068869(5) = 1 is a square;
8 is a term because A068869(8) = 81 is a square.
		

Crossrefs

Cf. A068869.

Programs

PARI

isok(n) = issquare((sqrtint(n!-1)+1)^2-n!); \\ Michel Marcus, Jan 30 2023