%I
%S 1870,935,1729,1045,374,2093,494,1235,2639,187,170,2737,190,247,4301,
%T 1265,110,2821,130,209,299,85,182,3367,418,95,3451,377,220,5423,230,
%U 1495,391,55,598,3458,238,65,133,253,260,403,266,115,5797,91,273,3689,741,319
%N Lexicographically earliest sequence of distinct positive terms such that, for any n > 0, among the prime divisors of n * a(n) there are at least 4 runs of consecutive prime numbers.
%C This sequence is a variant of A285744 and of A306864.
%C This sequence is a selfinverse permutation of the natural numbers.
%H Rémy Sigrist, <a href="/A306877/b306877.txt">Table of n, a(n) for n = 1..30000</a>
%H Rémy Sigrist, <a href="/A306877/a306877.gp.txt">PARI program for A306877</a>
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%F A287170(n * a(n)) >= 4.
%e The first terms, alongside the corresponding runs, are:
%e n a(n) runs in n*a(n)
%e   
%e 1 1870 2, 5, 11, 17
%e 2 935 2, 5, 11, 17
%e 3 1729 3, 7, 13, 19
%e 4 1045 2, 5, 11, 19
%e 5 374 2, 5, 11, 17
%e 6 2093 23, 7, 13, 23
%e 7 494 2, 7, 13, 19
%e 8 1235 2, 5, 13, 19
%e 9 2639 3, 7, 13, 29
%e 10 187 2, 5, 11, 17
%e 11 170 2, 5, 11, 17
%e 12 2737 23, 7, 17, 23
%e 13 190 2, 5, 13, 19
%e 14 247 2, 7, 13, 19
%e 15 4301 35, 11, 17, 23
%e 16 1265 2, 5, 11, 23
%o (PARI) See Links section.
%Y Cf. A285744, A287170, A306864.
%K nonn,look
%O 1,1
%A _Rémy Sigrist_, Mar 14 2019
