A158857 - cp's OEIS frontend

A158857 a(n), a(n+1), a(n+2), for n=5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two odd primes not belonging to A158848.

%I A158857 #4 Jun 02 2025 01:27:58
%S A158857 7,0,7,7,0,8,20,0,9,10,0,23,50,0,28,42,0,69,201,0,79,93,0,216,399,0,
%T A158857 278,445,0,684,1649,0,630,1008,0,2132,4892,0,3066,3681,0,6852
%N A158857 a(n), a(n+1), a(n+2), for n=5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two odd primes not belonging to A158848.
%Y A158857 Cf. A158848 A156537
%K A158857 nonn,uned
%O A158857 17,1
%A A158857 _Vladimir Shevelev_, Mar 28 2009

cp's OEIS Frontend

A158857 a(n), a(n+1), a(n+2), for n=5,8,11,... are respectively the numbers of representations of the integers 2^k-2, 2^k, 2^k+2, where k=(n+4)/3, by unordered sums of two odd primes not belonging to A158848.