Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #12 Oct 10 2019 03:59:45
%S 467,941,959941,3396199,4858943,5696101,6475643,7566133,7584253,
%T 7592261,9305281,9463877,11430491,13442243,14374837,15941473,17414497,
%U 17691997,19584223,21421849,22310159,22808459,27601163,29198881
%N Concatenation of prime p and nextprime(p) is prime -> cycles of 3 steps possible.
%C Terms from 3396199 up to 17691997 found by Jo Yeong Uk (hyukjo(AT)sigma.chungnam.ac.kr).
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_029.htm">Puzzle 29. Pi = P i-1&nxtprm(P i-1), Pi = prime for i => 1</a>, The Prime Puzzles & Problems Connection.
%Y Cf. A030459, A034593, A036339, A036341.
%K nonn,base
%O 0,1
%A _Patrick De Geest_, Dec 15 1998