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A164943 Decimal value of the concatenation of first n odd numbers in binary. 1
1, 7, 61, 495, 7929, 126875, 2030013, 32480223, 1039367153, 33259748915, 1064311965301, 34057982889655, 1089855452468985, 34875374479007547, 1116011983328241533, 35712383466503729087, 2285592541856238661601 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 29 08:01 EST 2023. Contains 359915 sequences. (Running on oeis4.)