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A111729 Historical progression of years from the song "In The Year 2525" by Denny Zager and Rick Evans. 0
2525, 3535, 4545, 5555, 6565, 7510, 8510, 9595, 2525 (list; graph; refs; listen; history; text; internal format)



Sequence is potentially cyclic. #1 Billboard hit 1969. Last "2525" added because first verse repeats at the end. Note that it also begins to transition into the second verse again after this in some editions, causing "3535" to be faintly audible. The lyrics of the song also imply the sequence is theoretically cyclic and recurring.


Table of n, a(n) for n=1..9.

Wikipedia, Zager and Evans

Wikipedia, In The Year 2525


for n<6 or n=8, a(n)= 101*(10n+15). For n=6 or 7, a(n) is irregular, and is equal 101*(10n+15) with the exception that the final two digits are fixed at 10.  Assuming the cyclic sequence, for n>8, a(n) = f(n mod 8), with the exception that when n mod 8 = 0, take a(n) = n(8) = 9595.


The opening lyric is "In the year 2525/if man is still alive/if woman can survive/they may find..." hence a(1)=2525.


Sequence in context: A031984 A045213 A251918 * A252288 A268332 A203440

Adjacent sequences:  A111726 A111727 A111728 * A111730 A111731 A111732




Jeff Cohen (jcohen(AT)cpan.org), Nov 18 2005


Added last 2525 to represent coda of first verse at end, also added formula - Gregory Koch, Mar 05 2011.



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Last modified December 8 06:50 EST 2016. Contains 278902 sequences.