A164943 Decimal value of the concatenation of first n odd numbers in binary.

1, 7, 61, 495, 7929, 126875, 2030013, 32480223, 1039367153, 33259748915, 1064311965301, 34057982889655, 1089855452468985, 34875374479007547, 1116011983328241533, 35712383466503729087, 2285592541856238661601

Offset

1,2

Links

Harvey P. Dale, Table of n, a(n) for n = 1..383

Example

a(3)=61 because the first 3 odd numbers in binary are 1 11 101, and the concatenation 111101 in base 10 = 61. a(4)=495 because the first 4 odd numbers in binary are 1 11 101 111, and the concatenation 111101111 in base 10 = 495.

Mathematica

Table[FromDigits[Flatten[IntegerDigits[Range[1, 2n+1, 2], 2]], 2], {n, 0, 20}] (* Harvey P. Dale, May 31 2019 *)

Crossrefs

Sequence in context: A249556 A135165 A218805 * A218228 A155599 A104093

Adjacent sequences: A164940 A164941 A164942 * A164944 A164945 A164946

Keyword

base,easy,nonn

Author

Gil Broussard, Sep 01 2009

Status

approved