A262901 Numbers that have at least one leaf-child in the tree generated by edge-relation A049820(child) = parent.

4, 5, 11, 14, 16, 17, 22, 27, 29, 32, 35, 41, 44, 46, 48, 51, 57, 58, 62, 65, 69, 70, 77, 80, 81, 91, 92, 96, 101, 102, 107, 110, 111, 114, 118, 119, 120, 128, 129, 130, 138, 139, 141, 144, 147, 148, 152, 155, 158, 161, 162, 165, 166, 169, 176, 181, 187, 191, 192, 199, 201, 214, 215, 216, 222, 224, 227, 231, 234, 238, 239, 247, 248, 249, 255, 258, 262, 264, 269, 277, 278, 282, 286, 291, 294, 296

Offset

1,1

Comments

Positions of nonzeros in A262900.

Numbers n such that there is at least one k such that k - d(k) = n [where d(k) is the number of divisors of k, A000005(k)], but there is no such x that x - d(x) = k, in other words, k is one of the terms of A045765.

Sequence A262902 sorted into ascending order, with duplicates removed.

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(Scheme, with Antti Karttunen's IntSeq-library)
(define A262901 (NONZERO-POS 1 0 A262900))

Crossrefs

Cf. A000005, A045765, A049820, A262900, A262902.

Cf. A262903 (a subsequence).

Subsequence of A236562.

Cf. also A257508.

Sequence in context: A379357 A039006 A191209 * A287574 A118423 A084812

Adjacent sequences: A262898 A262899 A262900 * A262902 A262903 A262904

Keyword

nonn

Author

Antti Karttunen, Oct 06 2015

Status

approved