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.

A230721 Odd sorting numbers, cf. A003071.

Original entry on oeis.org

1, 3, 5, 9, 11, 17, 25, 27, 33, 41, 45, 49, 65, 67, 73, 81, 85, 89, 101, 105, 109, 115, 119, 129, 161, 163, 169, 177, 181, 185, 197, 201, 205, 211, 215, 225, 245, 249, 253, 259, 263, 273, 283, 287, 297, 309, 315, 321, 385, 387, 393, 401, 405, 409, 421, 425
Offset: 1

Views

Author

Reinhard Zumkeller, Oct 28 2013

Keywords

Comments

A003071(a(n)) mod 2 = 1;
a(n) = A003071(A230709(n+1)).

Programs

  • Haskell
    a230721 = a003071 . a230709 . (+ 1)
    a230721_list = filter odd a003071_list