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Rearrangement of prime numbers p according to number of divisors of p-/+1.
1

%I #5 Mar 30 2012 17:26:11

%S 2,7,13,3,19,31,5,41,37,11,103,43,17,137,61,23,199,67,29,307,73,47,

%T 349,97,53,491,101,59,739,109

%N Rearrangement of prime numbers p according to number of divisors of p-/+1.

%C Number of divisors of p-1 (less than, equals and larger than) number of divisors of p+1. A103887 - position of p(n) in the sequence.

%F a(3k-2)=A103664(k); a(3k-1)=A067889(k); a(3k)=A103665(k); (k=1, 2, ...)

%t Table[{A103664[[n]], A067889[[n]], A103665[[n]]}, {n, 10}]//Flatten

%Y Cf. A067889, A103664, A103665, A103887.

%K nonn

%O 1,1

%A _Zak Seidov_, Feb 20 2005