A199399 Binary XOR of 5^k as k varies from 0 to n.

1, 4, 29, 96, 529, 3620, 13101, 66048, 325601, 1653380, 9189501, 40187552, 216562929, 1143607140, 5098589837, 26660767488, 161932208321, 635945960964, 4313170161629, 20567937335008, 74804061006033, 551572049610276, 2689136522898669, 10088864973699328, 67578042506892449

Offset: 0

Author

Paul D. Hanna, Nov 05 2011

Keywords

• nonn

Examples

			a(2) = 1 XOR 5 = 4; a(3) = 1 XOR 5 XOR 25 = 29; a(4) = 1 XOR 5 XOR 25 XOR 125 = 96.
		

Crossrefs

Cf. A199397.

Programs

PARI

{a(n)=if(n<0,0,bitxor(a(n-1),5^n))}