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 A084954 #14 Jun 01 2025 16:19:50 %S A084954 2,2,2,2,47,47,6047,477727,30596497,3388516667,340746580567, %T A084954 1763093883977,773521306107547,1142275515892937,391230854658184967 %N A084954 Initial prime of a prime chain of length n under the iteration x->2x+3. %C A084954 This is a special case of prime chains generated by f(x) = cx + d. %C A084954 Is it smallest initial prime of a prime chain of length n under the iteration x->2x+3, or not? At least up to 3388516667 it is the smallest one. - _Zak Seidov_, Dec 20 2013 %H A084954 D. H. Lehmer, <a href="http://dx.doi.org/10.1112/plms/s3-14A.1.183">On certain chains of primes</a>, Proc. London Math. Soc. (3) 14a 1965 183-186. %e A084954 a(3) = 2 since 2, 2*2+3=7 and 2*7+3=17 are primes. %Y A084954 Cf. A057330, A057331, A083388, A084955, A084956, A084957, A084958, A084959, A084960, A084961, A128509, A134701, A134702. %K A084954 nonn,more %O A084954 1,1 %A A084954 _W. Edwin Clark_, Jun 14 2003 %E A084954 More terms from _Don Reble_, Nov 07 2007 %E A084954 a(15) from _Bert Dobbelaere_, Jun 01 2025