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 A347739 Number of compositions (ordered partitions) of n into at most 2 prime parts. 5
 1, 0, 1, 1, 1, 3, 1, 3, 2, 2, 3, 1, 2, 3, 3, 2, 4, 1, 4, 3, 4, 2, 5, 1, 6, 2, 5, 0, 4, 1, 6, 3, 4, 2, 7, 0, 8, 1, 3, 2, 6, 1, 8, 3, 6, 2, 7, 1, 10, 2, 8, 0, 6, 1, 10, 2, 6, 0, 7, 1, 12, 3, 5, 2, 10, 0, 12, 1, 4, 2, 10, 1, 12, 3, 9, 2, 10, 0, 14, 1, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 LINKS Table of n, a(n) for n=0..80. FORMULA a(n) = Sum_{k=1..2} A121303(n,k) for n >= 2. - Alois P. Heinz, Sep 11 2021 MATHEMATICA Table[Length@Flatten[Permutations/@IntegerPartitions[n, 2, Prime@Range@PrimePi@n], 1], {n, 0, 100}] (* Giorgos Kalogeropoulos, Sep 12 2021 *) CROSSREFS Cf. A000040, A023360, A073610, A121303, A347740, A347741, A347742, A347743. Sequence in context: A171899 A355784 A213885 * A352931 A083208 A126682 Adjacent sequences: A347736 A347737 A347738 * A347740 A347741 A347742 KEYWORD nonn AUTHOR Ilya Gutkovskiy, Sep 11 2021 STATUS approved

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Last modified May 30 02:25 EDT 2023. Contains 363044 sequences. (Running on oeis4.)