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 A277937 Number of runs of 1's of length 1 in the binary expansion of n. 1
 0, 1, 1, 0, 1, 2, 0, 0, 1, 2, 2, 1, 0, 1, 0, 0, 1, 2, 2, 1, 2, 3, 1, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 2, 2, 1, 2, 3, 1, 1, 2, 3, 3, 2, 1, 2, 1, 1, 0, 1, 1, 0, 1, 2, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 2, 2, 1, 2, 3, 1, 1, 2, 3, 3, 2, 1, 2, 1, 1, 2, 3, 3, 2, 3, 4, 2 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS 2^a(n) is the run length transform of 1,2,1,1,1,1,.... LINKS Chai Wah Wu, Table of n, a(n) for n = 0..10000 FORMULA a(2n) = a(n), a(4n+1) = a(8n+1) = a(n) + 1, a(8n+3) = a(n), a(8n+5) = a(2n+1) + 1, a(8n+7) = a(4n+3). EXAMPLE a(25) = 1 since 25 = 11001_2 has one runs of 1's of length 1. PROG (Python) def A277937(n):     return sum(1 for d in bin(n)[2:].split('0') if len(d) == 1) CROSSREFS Sequence in context: A257900 A039971 A205593 * A334913 A112020 A069160 Adjacent sequences:  A277934 A277935 A277936 * A277938 A277939 A277940 KEYWORD nonn AUTHOR Chai Wah Wu, Mar 24 2017 STATUS approved

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Last modified November 28 08:12 EST 2021. Contains 349401 sequences. (Running on oeis4.)