A365716 - OEIS

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A365716

a(n) = 1 if the largest divisor of n <= sqrt(n) is a power of 2, otherwise 0.

1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 1, 0, 1, 1, 0

(list; graph; refs; listen; history; text; internal format)

OFFSET

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..100000

Index entries for characteristic functions

FORMULA

a(n) = A209229(A033676(n)).

a(n) >= A365605(n).

MATHEMATICA

Table[If[IntegerQ[Log2[Max[Select[Divisors[n], #<=Sqrt[n]&]]]], 1, 0], {n, 110}] (* Harvey P. Dale, May 26 2024 *)

PROG

(PARI)