A262897 Nonbranching nodes in the infinite trunk (A259934) of the tree generated by edge-relation A049820(child) = parent: a(n) = A259934(A262892(n)).

2, 12, 18, 30, 42, 54, 90, 94, 106, 121, 190, 194, 210, 236, 242, 254, 298, 302, 342, 346, 354, 366, 374, 390, 410, 426, 442, 466, 494, 530, 546, 558, 562, 566, 574, 606, 650, 658, 710, 716, 730, 746, 914, 942, 986, 1030, 1038, 1042, 1052, 1058, 1090, 1114, 1134, 1146, 1240, 1250, 1266, 1278, 1286, 1310, 1354, 1370, 1378, 1418, 1426, 1450, 1454, 1490, 1562, 1650, 1662, 1670, 1676, 1694, 1706

Offset

1,1

Comments

Equally, numbers n for which A060990(n)*A262693(n) = 1, thus an intersection of A262511 and A259934.

The next odd term after a(10) = 121 occurs at a(3372) = 113569.

Links

Antti Karttunen, Table of n, a(n) for n = 1..4085

Formula

a(n) = A259934(A262892(n)).

Prog

(Scheme, two alternatives; macro MATCHING-POS can be found from Antti Karttunen's IntSeq-library)
(define (A262897 n) (A259934 (A262892 n)))
(define A262897 (MATCHING-POS 1 0 (lambda (n) (and (= 1 (A060990 n)) (= 1 (A262693 n))))))

Crossrefs

Cf. A000005, A049820, A060990, A259934, A262511, A262693, A262892, A262896.

Cf. A262510 (a subsequence).

Sequence in context: A120350 A293851 A032413 * A281353 A257256 A325767

Adjacent sequences: A262894 A262895 A262896 * A262898 A262899 A262900

Keyword

nonn

Author

Antti Karttunen, Oct 06 2015

Status

approved