A145827 Numbers n such that A145768(n) is a square.

0, 1, 7, 9, 14, 15, 16, 24, 33, 63, 89, 193, 240, 255, 271, 430, 448, 528, 575, 729, 742, 783, 903, 1297, 1776, 2409, 2623, 3494, 4079, 4159, 5439, 8278, 13631, 13737, 16128, 41825, 53007, 64344, 95985, 99015, 100607, 138238, 147734, 198976, 256177, 262079, 262335, 278847

Offset

1,3

Links

Table of n, a(n) for n=1..48.

Prog

(PARI) an=0; for(i=1, 10^5, an=bitxor(an, i^2); issquare(an)&print1(i", "))
(Python)
import math
x = 0
for i in range(1<<20):
    x ^= i*i
    t = int(math.sqrt(x))
    if x == t*t:
        print(str(i), end=', ')
# Alex Ratushnyak, Mar 27 2013

Crossrefs

A145828 = A145768 intersect A000290 = { A145768(a(n)) }.

Sequence in context: A365986 A063189 A004472 * A116025 A344011 A320325

Adjacent sequences: A145824 A145825 A145826 * A145828 A145829 A145830

Keyword

easy,base,nonn

Author

M. F. Hasler, Oct 20 2008

Extensions

More terms from Alex Ratushnyak, Mar 27 2013

Status

approved