A078274 - cp's OEIS frontend

A078274 a(n) is the number from which if odd-positioned digits are deleted then one gets the concatenation of first n odd numbers, while if even-positioned digits are deleted then one gets reverse concatenation of first n odd numbers. Position of least significant digit is considered to be 1.

n	a(n)
1	11
2	1331
3	153351
4	17355371
5	1937557391
6	11315977951311
7	113351719917151331
8	1135517391111917351351
9	11375175911311113917551371
10	113951779115111331115917751391
11	1231517991171115311351117917952311
12	12335271911911173115511371119927152331

[11, 1331, 153351, 17355371, 1937557391, 11315977951311, 113351719917151331, 1135517391111917351351, 11375175911311113917551371, 113951779115111331115917751391, 1231517991171115311351117917952311, 12335271911911173115511371119927152331]

cp's OEIS Frontend

A078274 a(n) is the number from which if odd-positioned digits are deleted then one gets the concatenation of first n odd numbers, while if even-positioned digits are deleted then one gets reverse concatenation of first n odd numbers. Position of least significant digit is considered to be 1.

Table of values

List of values