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 A117119 Number of partitions of 2*n into two odd prime powers. 0
 1, 1, 2, 2, 3, 3, 4, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 5, 6, 6, 6, 7, 8, 6, 9, 7, 6, 8, 7, 6, 8, 7, 7, 9, 8, 7, 9, 8, 7, 11, 9, 7, 12, 8, 7, 9, 9, 8, 10, 8, 9, 12, 11, 9, 12, 9, 8, 13, 9, 8, 13, 10, 11, 14, 11, 8, 13, 12, 10, 13, 9, 9, 16, 10, 11, 14, 10, 10, 15, 10, 9, 16, 12, 9, 16, 12, 11, 18 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS conjecture: a(n) > 0; a(n) > A002375(n). LINKS Eric Weisstein's World of Mathematics, Goldbach Conjecture EXAMPLE a(1) = #{1+1} = 1; a(2) = #{1+3} = 1; a(3) = #{1+5, 3+3} = 2; a(20) = #{3+37, 3^2+31, 11+29, 13+3^3, 17+23} = 5; a(21) = #{1+41, 5+37, 11+31, 13+29, 17+5^2, 19+23} = 6. CROSSREFS Sequence in context: A066412 A196048 A176075 * A208280 A139141 A122953 Adjacent sequences:  A117116 A117117 A117118 * A117120 A117121 A117122 KEYWORD nonn AUTHOR Reinhard Zumkeller, Apr 15 2006 STATUS approved

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