1,1

Numbers n for which both A079559(A213723(n)) and A079559(A213724(n)) are zero.

Numbers which occur twice in A257507.

Antti Karttunen, Table of n, a(n) for n = 1..16384

Paul Tek, Illustration of how natural numbers in range 0 .. 133 are organized as a binary tree in the binary beanstalk

10 is present, because A011371(12) = A011371(13) = 10, and both 12 and 13 are terms of A055938. See also Paul Tek's illustration.

(Scheme, with Antti Karttunen's IntSeq-library)

(define A257512 (MATCHING-POS 1 0 (lambda (n) (and (zero? (A079559 (A213723 n))) (zero? (A079559 (A213724 n)))))))

Cf. A011371, A055938, A079559, A213723, A213724, A257507, A257265.

First differences: A256490.

Subsequence of A005187, A213717 and A257508.

Sequence in context: A213717 A245578 A165250 * A125689 A244573 A230356

Adjacent sequences: A257509 A257510 A257511 * A257513 A257514 A257515

nonn

Antti Karttunen, May 03 2015

approved