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 A333548 Numbers k such that A005132(k-1) = k. 5
 3, 11, 39, 248, 844, 2752, 57071, 58056875 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subtracting 1 from k gives the index of a term A005132(k-1) = k in Recaman's sequence A005132 such that subtracting k would reach 0. This is not permitted, so we must add k instead, obtaining A005132(k) = 2*k. If A005132(k-1) = k, A005132(k) = 2*k. The converse is not always true. For example, A005132(75) = 228 and A005132(76) = 228 - 76 = 152. - Seiichi Manyama, May 02 2020 LINKS EXAMPLE A005132(10)=11, so 11 is a term (and A005132(11)=22). PROG (Python) A333548_list, A005132_set, y = [], {0}, 0 for n in range(1, 10**10):     y -= n     if y <= 0 or y in A005132_set:         y += 2*n     A005132_set.add(y)     if y == n+1:         A333548_list.append(y) # Chai Wah Wu, May 02 2020 CROSSREFS Cf. A005132, A064568, A064569, A187921, A187922, A331659. Sequence in context: A149061 A149062 A066979 * A136775 A108153 A010911 Adjacent sequences:  A333545 A333546 A333547 * A333549 A333550 A333551 KEYWORD nonn,more AUTHOR N. J. A. Sloane, May 01 2020 EXTENSIONS a(8) from Chai Wah Wu, May 02 2020 STATUS approved

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Last modified September 19 05:33 EDT 2020. Contains 337176 sequences. (Running on oeis4.)