A249166 Odd integers concatenated with themselves.

11, 33, 55, 77, 99, 1111, 1313, 1515, 1717, 1919, 2121, 2323, 2525, 2727, 2929, 3131, 3333, 3535, 3737, 3939, 4141, 4343, 4545, 4747, 4949, 5151, 5353, 5555, 5757, 5959, 6161, 6363, 6565, 6767, 6969, 7171, 7373, 7575, 7777, 7979, 8181, 8383, 8585, 8787

Offset: 1

Author

M. F. Hasler, Oct 22 2014

Keywords

• nonn
• base

Comments

Bisection (every other term) of A020338. See A248422 for the complement.

Crossrefs

Cf. A020338, A248422.

Programs

Magma

[Seqint(Intseq(n) cat Intseq(n)): n in [1..99 by 2]]

PARI

a(n) = eval(Str(2*n-1,2*n-1))