The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A055254

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A055254

Number of odd digits in 2^n.
(history; published version)

#44 by N. J. A. Sloane at Fri Oct 27 22:00:46 EDT 2023

AUTHOR

_Asher Auel (asher.auel(AT)reed.edu), _, May 05 2000

Discussion

Fri Oct 27

22:00

OEIS Server: https://oeis.org/edit/global/2974

#43 by Michael De Vlieger at Fri Dec 23 17:26:12 EST 2022

STATUS

proposed

approved

#42 by Michel Marcus at Fri Dec 23 17:05:36 EST 2022

STATUS

editing

proposed

#41 by Michel Marcus at Fri Dec 23 17:05:32 EST 2022

REFERENCES

D. Bowman and T. White, Proposers, Problem 6609, A rational sum, Amer. Math. Monthly, 98:3 (1991), 279-281.

LINKS

D. Bowman and T. White, Proposers, <a href="https://www.jstor.org/stable/2325046">Problem 6609, A rational sum</a>, Amer. Math. Monthly, 98:3 (1991), 279-281.

STATUS

proposed

editing

#40 by Michael S. Branicky at Fri Dec 23 16:29:06 EST 2022

STATUS

editing

proposed

#39 by Michael S. Branicky at Fri Dec 23 16:29:04 EST 2022

PROG

(Python)

def a(n): return sum(1 for d in str(1<<n) if d in "13579")

print([a(n) for n in range(91)]) # Michael S. Branicky, Dec 23 2022

STATUS

approved

editing

#38 by N. J. A. Sloane at Wed Jul 28 12:59:15 EDT 2021

STATUS

editing

approved

#37 by N. J. A. Sloane at Wed Jul 28 12:59:13 EDT 2021

REFERENCES

J. Borwein, D. Bailey and R. Girgensohn, Experimentation in mathematics : computational paths to discovery, A. K. Peters, 2004, pp. 14-15.

D. Bowman and T. White, Proposers, Problem 6609, A rational sum, Amer. Math. Monthly, 98:3 (1991), 279-281.

STATUS

approved

editing

#36 by Susanna Cuyler at Mon Dec 23 18:59:00 EST 2019

STATUS

reviewed

approved

#35 by Michel Marcus at Mon Dec 23 17:08:16 EST 2019

STATUS

proposed

reviewed