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 A262901 Numbers that have at least one leaf-child in the tree generated by edge-relation A049820(child) = parent. 7
 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 (list; graph; refs; listen; history; text; internal format)
 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: A370980 A039006 A191209 * A287574 A118423 A084812 Adjacent sequences: A262898 A262899 A262900 * A262902 A262903 A262904 KEYWORD nonn AUTHOR Antti Karttunen, Oct 06 2015 STATUS approved

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Last modified June 14 04:49 EDT 2024. Contains 373393 sequences. (Running on oeis4.)