cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-4 of 4 results.

A122241 Iterates of A122237, starting from 4.

Original entry on oeis.org

4, 22, 54, 169, 516, 1841, 6076, 19256, 66140, 252691, 888179, 2900616
Offset: 1

Views

Author

Antti Karttunen, Sep 14 2006

Keywords

Comments

It might be more natural to use offset 0 for the initial value a(0) = 4 since that's not the result of an actual iteration of the map A122237. However, some other sequences (A122242, A179845, A179841, ...?) depend on this and have b-files that would require to be changed. - M. F. Hasler, Jul 18 2025

Crossrefs

Cf. A122237 = A057548 o A082358, A122242 = A014486 o A122241.

Programs

Formula

a(n+1) = A122237(a(n)) for n >= 1; a(1) = 4.

A179764 Partial sums of -(A033999(A179761(n))).

Original entry on oeis.org

1, 0, 1, 0, 1, 0, 1, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 2, 1, 2, 1, 2, 1, 0, 1, 2, 3, 2, 3, 2, 3, 2, 1, 2, 1, 0, 1, 2, 3, 2, 3, 2, 1, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 4, 3, 2, 3, 2, 3, 2, 1, 2, 3, 2, 1, 0, 1, 2, 3, 4, 3, 2, 3, 2, 1, 2, 1, 2, 3, 4, 3, 2, 1, 0, 1, 2, 3, 2, 3, 4, 3, 2, 3, 2, 3, 2, 1, 2, 1, 2, 3, 2
Offset: 1

Views

Author

Antti Karttunen, Aug 03 2010

Keywords

Comments

The local maximum in range [(2*A000217(n+1))-5,(2*A000217(n+2))-6] (i.e. [1,6], [7,14], [15,24], [25,36], [37,50], [51,66], ...) is given by A179845(n).

Links

Crossrefs

Cf. also A179761 & A179759, A179765-A179766.

A179844 a(n) = A179752(A080068(n)).

Original entry on oeis.org

1, 1, 2, 2, 3, 2, 3, 3, 3, 3, 4, 4, 4, 4, 3, 4, 6, 6, 5, 4, 5, 6, 7, 7, 6, 6, 6, 7, 8, 6, 6, 6, 6, 5, 7, 8, 8, 7, 7, 8, 9, 8, 5, 6, 9, 11, 10, 8, 6, 7, 9, 10, 9, 9, 10, 12, 9, 9, 9, 10, 9, 10, 12, 12, 13, 10, 8, 10, 10, 11, 11, 11, 12, 14, 14, 9, 7, 8, 10, 11, 13, 13, 14, 15, 14, 13, 11, 10
Offset: 1

Views

Author

Antti Karttunen, Aug 03 2010

Keywords

Comments

a(n) is also the local maximum of A179759 in range [(2*A000217(n-1))+1,2*A000217(n)].

Links

Crossrefs

Cf. also A080071, A154477, A179840 & A179845-A179847.

A179841 a(n) = A179751(A122241(n)).

Original entry on oeis.org

3, 4, 4, 5, 5, 5, 6, 6, 7, 6, 7, 8, 9, 8, 9, 10, 11, 10, 10, 10, 11, 12, 10, 10, 10, 12, 11, 13, 14, 13, 14, 12, 14, 14, 15, 17, 17, 17, 18, 20, 20, 18, 19, 18, 18, 17, 19, 18, 19, 20, 20, 19, 20, 17, 19, 18, 19, 21, 21, 19, 20, 18, 23, 22, 21, 20, 24, 26, 26, 27, 23, 22, 28, 29
Offset: 1

Views

Author

Antti Karttunen, Aug 03 2010

Keywords

Links

Crossrefs

Cf. also A179845 & A179840-A179843.
Showing 1-4 of 4 results.

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