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 A086801 #23 Feb 04 2024 01:15:13 %S A086801 -1,0,2,4,8,10,14,16,20,26,28,34,38,40,44,50,56,58,64,68,70,76,80,86, %T A086801 94,98,100,104,106,110,124,128,134,136,146,148,154,160,164,170,176, %U A086801 178,188,190,194,196,208,220,224,226,230,236,238,248,254,260,266,268,274,278 %N A086801 a(n) = prime(n) - 3. %C A086801 Numbers n such that n+3 is a prime. %D A086801 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988 %D A086801 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta, UTET, CittaStudiEdizioni, Milano 1997 %F A086801 a(n) = 2*A067076(n) = 2*(A006254(n+1)-2). %e A086801 n=16 is here because 16+3=19 is a prime. %t A086801 Prime[Range[22]]-3 (* _Vladimir Joseph Stephan Orlovsky_, Apr 29 2008 *) %o A086801 (PARI) for(x=2,20,print1(prime(x)-3,",")) \\ _Jorge Coveiro_, Jan 30 2006 %Y A086801 Cf. A006254, A067076, A091738, A116127, A119981, A173064. %K A086801 easy,sign %O A086801 1,3 %A A086801 _Giovanni Teofilatto_, Aug 05 2003 %E A086801 Extended by _Ray Chandler_, Nov 29 2003