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Revision History for A007378 (Bold, blue-underlined text is an addition; faded, red-underlined text is a deletion.)

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a(n), for n >= 2, is smallest positive integer which is consistent with sequence being monotonically increasing and satisfying a(a(n)) = 2n.
(history; published version)
#64 by Michael De Vlieger at Mon Jan 08 09:02:57 EST 2024
STATUS

reviewed

approved

#63 by Joerg Arndt at Mon Jan 08 05:48:50 EST 2024
STATUS

proposed

reviewed

#62 by Michel Marcus at Mon Jan 08 02:46:54 EST 2024
STATUS

editing

proposed

#61 by Michel Marcus at Mon Jan 08 02:46:49 EST 2024
REFERENCES

Hsien-Kuei Hwang, S Janson, TH Tsai, Exact and asymptotic solutions of the recurrence f(n) = f(floor(n/2)) + f(ceiling(n/2)) + g(n): theory and applications, Preprint, 2016; http://140.109.74.92/hk/wp-content/files/2016/12/aat-hhrr-1.pdf. Also Exact and Asymptotic Solutions of a Divide-and-Conquer Recurrence Dividing at Half: Theory and Applications, ACM Transactions on Algorithms, 13:4 (2017), #47; DOI: 10.1145/3127585

LINKS

Hsien-Kuei Hwang, S. Janson, and T.-H. Tsai, <a href="http://140.109.74.92/hk/wp-content/files/2016/12/aat-hhrr-1.pdf">Exact and asymptotic solutions of the recurrence f(n) = f(floor(n/2)) + f(ceiling(n/2)) + g(n): theory and applications</a>, Preprint, 2016.

Hsien-Kuei Hwang, S. Janson, and T.-H. Tsai, <a href="https://doi.org/10.1145/3127585">Exact and Asymptotic Solutions of a Divide-and-Conquer Recurrence Dividing at Half: Theory and Applications</a>, ACM Transactions on Algorithms, 13:4 (2017), #47.

#60 by Michel Marcus at Mon Jan 08 02:45:50 EST 2024
LINKS

Benoit Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="httphttps://www.cs.uwaterloo.ca/journals/JIS/indexVOL6/Cloitre/cloitre2.html">Numerical analogues of Aronson's sequence</a>, J. Integer Seqs., Vol. 6 (2003), #03.2.2.

FORMULA

G.f. : -x/(1-x) + x/(1-x)^2 * (2 + sum(k>=0, t^2(t-1), t=x^2^k)). - Ralf Stephan, Sep 12 2003

#59 by Michel Marcus at Mon Jan 08 02:44:37 EST 2024
REFERENCES

J.-P. Allouche, N. Rampersad and J. Shallit, On integer sequences whose first iterates are linear, Aequationes Math. 69 (2005), 114-127

J.-P. Allouche and J. Shallit, The ring of k-regular sequences, II, Theoret. Computer Sci., 307 (2003), 3-29.

LINKS

J.-P. Allouche, N. Rampersad and J. Shallit, <a href="https://doi.org/10.1007/s00010-004-2750-x">On integer sequences whose first iterates are linear</a>, Aequationes Math. 69 (2005), 114-127.

J.-P. Allouche and J. Shallit, <a href="https://doi.org/10.1016/S0304-3975(03)00090-2">The ring of k-regular sequences, II</a>, Theoret. Computer Sci., 307 (2003), 3-29.

STATUS

approved

editing

#58 by Charles R Greathouse IV at Wed Dec 14 10:05:47 EST 2022
STATUS

editing

approved

#57 by Charles R Greathouse IV at Wed Dec 14 10:05:45 EST 2022
COMMENTS

Lower density 2/3, upper density 3/4. - Charles R Greathouse IV, Dec 14 2022

STATUS

approved

editing

#56 by Michael De Vlieger at Mon Aug 08 20:24:56 EDT 2022
STATUS

proposed

approved

#55 by Kevin Ryde at Mon Aug 08 18:28:19 EDT 2022
STATUS

editing

proposed