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A262681 Odd bisection of A262680. 4
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,85

COMMENTS

Number of perfect squares (A000290) encountered before zero is reached when starting from k = 2n+1 and repeatedly applying the map that replaces k by k - d(k), where d(k) is the number of divisors of k (A000005). This count includes n itself if it is a square, but excludes the zero.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..10082

FORMULA

a(n) = A262680((2*n)+1).

PROG

(Scheme) (define (A262681 n) (A262680 (+ n n 1)))

CROSSREFS

Cf. A000005, A000290, A010052, A049820, A155043, A262677, A262680, A262682.

Sequence in context: A103496 A124921 A267863 * A076498 A110268 A058965

Adjacent sequences:  A262678 A262679 A262680 * A262682 A262683 A262684

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 03 2015

STATUS

approved

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Last modified June 16 13:25 EDT 2019. Contains 324152 sequences. (Running on oeis4.)