The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A050250 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A050250

Number of nonzero palindromes less than 10^n.
(history; published version)

#65 by Michael De Vlieger at Mon Oct 16 18:28:01 EDT 2023

STATUS

reviewed

approved

#64 by Robert C. Lyons at Mon Oct 16 18:09:21 EDT 2023

STATUS

proposed

reviewed

#63 by Darío Clavijo at Mon Oct 16 15:27:28 EDT 2023

STATUS

editing

proposed

Discussion

Mon Oct 16

15:28

Darío Clavijo: solved...

15:54

Michael S. Branicky: thanks!

#62 by Darío Clavijo at Mon Oct 16 15:27:19 EDT 2023

PROG

a = lambda n:((10**(n>>1))-1)<<1 if n & 1 == 0 else (11*(10**(n>>1)))-2 # _Darío Clavijo, Oct 16 2023

def a(n):

m = 10 ** (n >> 1)

if n & 1 == 0:

return (m - 1) << 1

else:

return (11 * m) - 2 # Darío Clavijo, Oct 16 2023

#61 by Alois P. Heinz at Mon Oct 16 14:35:24 EDT 2023

STATUS

proposed

editing

Discussion

Mon Oct 16

14:52

Michael S. Branicky: should use "def a(n): return ..." (this is not code golf)

#60 by Darío Clavijo at Mon Oct 16 13:43:54 EDT 2023

STATUS

editing

proposed

Discussion

Mon Oct 16

14:35

Alois P. Heinz: name is not clickable ...

#59 by Darío Clavijo at Mon Oct 16 13:43:28 EDT 2023

PROG

(Python)

a = lambda n:((10**(n>>1))-1)<<1 if n & 1 == 0 else (11*(10**(n>>1)))-2 # _Darío Clavijo, Oct 16 2023

STATUS

approved

editing

#58 by Michael De Vlieger at Sat Jun 11 07:54:08 EDT 2022

STATUS

reviewed

approved

#57 by Peter Luschny at Sat Jun 11 06:00:15 EDT 2022

STATUS

proposed

reviewed

#56 by Peter Luschny at Sat Jun 11 06:00:10 EDT 2022

STATUS

editing

proposed