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%I #6 Dec 05 2019 21:00:35
%S 2,17,19,29,31,41,43,53,67,71,79,89,97,101,103,109,113,127,131,137,
%T 139,149,151,163,173,181,191,197,199,211,223,229,233,239,241,251,257,
%U 269,271,281,283,293,307,311,317,331,337,349,353,367,373,379,389,401,409
%N Primes p such that p-1 and p+1 are both non-semiprime.
%C 2 together with A060254.
%F a(n+1)=A060254(n)=A167915(n+1).
%e a(1)=2 because 2-1=1=non-semiprime and 2+1=3=non-semiprime.
%K nonn
%O 1,1
%A _Juri-Stepan Gerasimov_, Apr 28 2010
%E Corrected (233, 239 inserted, 279 and 289 replaced by 379 and 389) by _R. J. Mathar_, Aug 12 2010
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