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Numbers of the form p^A001317(k) where p is prime and k >= 0.
5

%I #9 Feb 11 2016 12:08:39

%S 2,3,5,7,8,11,13,17,19,23,27,29,31,32,37,41,43,47,53,59,61,67,71,73,

%T 79,83,89,97,101,103,107,109,113,125,127,131,137,139,149,151,157,163,

%U 167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,243,251,257,263,269,271,277,281,283,293,307,311,313

%N Numbers of the form p^A001317(k) where p is prime and k >= 0.

%C Sequence A268392 sorted into ascending order.

%H Antti Karttunen, <a href="/A268391/b268391.txt">Table of n, a(n) for n = 1..10000</a>

%o (Scheme, with _Antti Karttunen_'s IntSeq-library)

%o (define A268391 (MATCHING-POS 1 1 (lambda (n) (and (= 1 (A001221 n)) (= 1 (A268384 (A067029 n)))))))

%Y Cf. A001221, A001317, A050376, A067029, A268384, A268392.

%Y Cf. A000040 (subsequence).

%Y Subsequence of A000961 and A246551.

%Y Differs from A171561 and A246551 for the first time at n=36, which here a(36) = 131.

%K nonn

%O 1,1

%A _Antti Karttunen_, Feb 10 2016