A190480 Concatenation of first n digits in the concatenation of first n primes written in base 2.

1, 10, 101, 1011, 10111, 101110, 1011101, 10111011, 101110111, 1011101111, 10111011111, 101110111110, 1011101111101, 10111011111011, 101110111110111, 1011101111101111, 10111011111011110, 101110111110111101, 1011101111101111011

Offset: 1

Author

Juri-Stepan Gerasimov, May 24 2011

Keywords

• nonn
• easy
• base

Comments

The terms are 1, 2, 5, 11, 23, 46, 93, 185, 375, ... in decimal.

The terms are the first n digits of the concatenation 10//11//101//111//1011//1101//.. generated with A004676.

Crossrefs

Cf. A019518.

Programs

Mathematica

With[{cc=Flatten[Table[IntegerDigits[p,2],{p,Prime[ Range[ 10]]}]]},Table[ FromDigits[Take[cc,n]],{n,Length[cc]}]] (* Harvey P. Dale, Jan 26 2021 *)