A175358 Irregular array read by rows: Row n contains A043276(n) terms. a(n,m) = number of runs (of either 0 or 1) of length m in the binary representation of n.

1, 2, 0, 1, 1, 1, 3, 1, 1, 0, 0, 1, 1, 0, 1, 2, 1, 4, 2, 1, 0, 2, 2, 1, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 2, 0, 1, 3, 1, 1, 2, 3, 1, 5, 3, 1, 2, 0, 1, 0, 1, 1, 1, 2, 3, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 0, 0, 1, 2, 0, 0, 1, 3, 0, 1, 1

Offset

1,2

Links

Rémy Sigrist, Rows n = 1..2048, flattened

Example

23 in binary is 10111. There are two runs of length 1, zero runs of length 2, and one run of length 3. So, row 23 is (2,0,1).

Prog

(PARI) row(n) = my (r=[]); while (n, my (v=valuation(n+(n%2), 2)); r = concat(v, r); n\=2^v); my (f=vector(vecmax(r))); for (i=1, #r, f[r[i]]++); f \\ Rémy Sigrist, Feb 13 2019

Crossrefs

A043276

Sequence in context: A120648 A215401 A254606 * A235330 A029394 A357914

Adjacent sequences: A175355 A175356 A175357 * A175359 A175360 A175361

Keyword

base,nonn,tabf

Author

Leroy Quet, Apr 22 2010

Extensions

More terms from Rémy Sigrist, Feb 13 2019

Status

approved