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

1,2

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.

Links

Table of n, a(n) for n=1..19.

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 *)

Crossrefs

Cf. A019518.

Sequence in context: A266720 A033128 A094945 * A267623 A283508 A261200

Adjacent sequences: A190477 A190478 A190479 * A190481 A190482 A190483

Keyword

nonn,easy,base

Author

Juri-Stepan Gerasimov, May 24 2011

Status

approved