A300557 -id:A300557 - cp's OEIS frontend

A300578 a(n) is the decimal expansion of A300557(n).

1, 26, 1727, 7076132, 231870716781, 60783517180063158, 127472274621203814023167, 547489250644801169379970741995656, 37623174822895486958552494948931181936744857, 41367118191622837379322233166045341842673946719874099882

Offset: 1

Seiichi Manyama, Mar 09 2018

			n |  A300557(n)             |  a(n)
--------------------------------------
1 | 1                       | 1
2 | 11010                   | 26
3 | 11010111111             | 1727
4 | 11010111111100100100100 | 7076132

Seiichi Manyama, Table of n, a(n) for n = 1..35

Cf. A300557.

A300558 a(n) is the concatenation n written in base 2 n times, n-1 written in base 2 n-1 times, ..., 1 written in base 2 once.

Original entry on oeis.org

1, 10101, 11111110101, 10010010010011111110101, 10110110110110110010010010011111110101, 11011011011011011010110110110110110010010010011111110101, 11111111111111111111111011011011011011010110110110110110010010010011111110101

Offset: 1

Seiichi Manyama, Mar 08 2018

Seiichi Manyama, Table of n, a(n) for n = 1..21

Cf. A007088, A300517, A300557.

def A300558(n)
  a = '1'
  [1] + (2..n).map{|i| a = (i.to_s(2) * i + a.to_s).to_i}
end
p A300558(10)

cp's OEIS Frontend

A300578 a(n) is the decimal expansion of A300557(n).

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