This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A115020 #27 May 10 2019 06:50:26 %S A115020 100,93,86,79,72,65,58,51,44,37,30,23,16,9,2 %N A115020 Count backwards from 100 in steps of 7. %C A115020 Sometimes used to gauge the concentration ability of a patient with Alzheimer's disease. The combination of a simple arithmetic operation with an unusual decrement forces the patient to rely on short-term memory for the computation. Most patients would stop when they get to 2, but the psychiatrist might be satisfied with the first five or so terms. In this capacity the sequence is mentioned a few times in the movie "Safe House" (1998) in which Mace Sowell (Patrick Stewart) tries to memorize the sequence and is asked it by the psychiatrist (Hector Elizondo). In real life, other decrements can be used; Fish (1996) suggests 3 and 4. %C A115020 In the next-to-last episode of "Boston Legal," Denny Crane (William Shatner) is asked this sequence by a doctor while in an MRI machine. He gets confused at 86, following it with 81. (Both Shatner and Stewart have played captain of the Enterprise on TV.) - Wilfredo Lopez (chakotay147138274(AT)yahoo.com), Dec 03 2008 %D A115020 Sharon Fish, "Alzheimer's: Caring for Your Loved One, Caring for Yourself", Wheaton, Illinois: Harold Shaw Publishers, 1996, p. 34 %H A115020 Max Hayman, <a href="https://doi.org/10.1001/archneurpsyc.1942.02290030112010">Two minute clinical test for measurement of intellectual impairment in psychiatric disorders</a>, Arch. Neurpsych. 47:3 (1942), pp. 454-464. %H A115020 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %H A115020 Robert Thomas Manning, <a href="https://doi.org/10.1001/archinte.1982.00340190148022">The serial sevens test</a>, Arch Intern Med. 142:6 (1982), p. 1192. %H A115020 Wikipedia, <a href="https://en.wikipedia.org/wiki/Serial_sevens">Serial sevens</a> %F A115020 a(n) = 100 - 7n. %t A115020 Range[100, 2, -7] (* _Harvey P. Dale_, Apr 11 2014 *) %o A115020 (PARI) a(n)=100-7*n \\ _Charles R Greathouse IV_, Feb 25 2019 %o A115020 (Scala) (0 to 14).map(100 - 7 * _) // _Alonso del Arte_, May 09 2019 %Y A115020 First fifteen terms of A017005 backwards. %K A115020 easy,fini,full,nonn %O A115020 0,1 %A A115020 Robert Happelberg (roberthappelberg(AT)yahoo.com), Feb 23 2006