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A167419 Exchange adjacent nonprimes and primes. 0


%S 2,1,4,3,6,5,8,7,9,11,10,13,12,14,15,17,16,19,18,20,21,23,22,24,25,26,

%T 27,29,28,31,30,32,33,34,35,37,36,38,39,41,40,44,43,45,47,46,48,49,50,

%U 51,53,52,54,55,56,57,59,58,61,60,62,63,65,65,67,66,68,69,71,70,73,72

%N Exchange adjacent nonprimes and primes.

%C If we have consecutive numbers, one prime and one nonprime, swap them. So after the initial 2,1,4,3,6,5,8,7 we have "if n is prime, a(n) = n-1; if n+1 is prime, a(n) = n+1, otherwise a(n) = n".

%Y Cf. A014681

%K easy,nonn

%O 1,1

%A _Giovanni Teofilatto_, Nov 03 2009

%E Edited by Franklin T. Adams-Watters, Nov 04 2009

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Last modified April 12 15:00 EDT 2021. Contains 342921 sequences. (Running on oeis4.)