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Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!) A171963 Number of partitions of the n-th semiprime into two semiprimes. 3 0, 0, 0, 1, 1, 1, 1, 0, 2, 1, 0, 1, 3, 1, 3, 1, 3, 1, 5, 2, 2, 1, 3, 3, 3, 4, 2, 2, 4, 4, 8, 3, 3, 8, 4, 5, 8, 3, 6, 7, 3, 5, 7, 9, 5, 5, 7, 10, 7, 6, 11, 5, 8, 7, 5, 9, 8, 8, 9, 6, 10, 8, 8, 7, 11, 9, 9, 10, 9, 7, 15, 12, 10, 11, 9, 10, 15, 9, 12, 10, 12, 12, 13, 11, 11, 11, 15, 12, 17, 12, 13, 16, 14 (list; graph; refs; listen; history; text; internal format) OFFSET 1,9 COMMENTS a(n) = A072931(A001358(n)). LINKS R. Zumkeller, Table of n, a(n) for n = 1..1000 EXAMPLE a(13) = A072931(A001358(13)) = A072931(35) = #{26+9,25+10,21+14} = #{2*13+3*3,5*5+2*5,3*7+2*7} = 3. CROSSREFS Sequence in context: A278528 A257261 A355141 * A357928 A292131 A255740 Adjacent sequences: A171960 A171961 A171962 * A171964 A171965 A171966 KEYWORD nonn AUTHOR Reinhard Zumkeller, Jan 21 2010 STATUS approved

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Last modified August 18 08:40 EDT 2024. Contains 375255 sequences. (Running on oeis4.)