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 A105390 Number of Hannah Rollman's numbers <= n. 6
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 9, 10, 10, 10, 11, 11, 11, 11, 11, 12, 13, 14, 15, 15, 15, 16, 16, 16, 16, 17, 18, 19, 20, 21, 21, 21, 22, 22, 22, 23, 24, 25, 26, 27, 28, 28 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,23 COMMENTS a(n) = #{k: A048992(k)<=n} = n - #{k: A048991(k)<=n}; a(n) < n/2 for n < 740; a(n) > n/2 for 740 < n < 1260, see A105391 for numbers m with a(m) = m/2. LINKS Klaus Brockhaus, Table of n, a(n) for n = 1..6000 Klaus Brockhaus, Plots of A105390(n)/n at various scales PROG (JBASIC, from Klaus Brockhaus, Aug 15 2007) s\$ = "" : d = 0 FOR n = 1 TO 100 sn\$ = str\$(n) IF instr(s\$, sn\$) > 0 THEN d = d+1 ELSE s\$ = s\$ + sn\$ print d ; ", "; NEXT CROSSREFS Cf. A048991, A048992, A105391, A131981. Sequence in context: A279041 A072746 A179528 * A347941 A013941 A061798 Adjacent sequences: A105387 A105388 A105389 * A105391 A105392 A105393 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Apr 04 2005 STATUS approved

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Last modified May 19 14:04 EDT 2024. Contains 372697 sequences. (Running on oeis4.)