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A324588
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Heinz numbers of integer partitions of n into perfect squares (A001156).
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11
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1, 2, 4, 7, 8, 14, 16, 23, 28, 32, 46, 49, 53, 56, 64, 92, 97, 98, 106, 112, 128, 151, 161, 184, 194, 196, 212, 224, 227, 256, 302, 311, 322, 343, 368, 371, 388, 392, 419, 424, 448, 454, 512, 529, 541, 604, 622, 644, 661, 679, 686, 736, 742, 776, 784, 827, 838
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OFFSET
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1,2
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COMMENTS
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The Heinz number of an integer partition (y_1, ..., y_k) is prime(y_1) * ... * prime(y_k).
Also products of elements of A011757.
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LINKS
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EXAMPLE
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The sequence of terms together with their prime indices begins:
1: {}
2: {1}
4: {1,1}
7: {4}
8: {1,1,1}
14: {1,4}
16: {1,1,1,1}
23: {9}
28: {1,1,4}
32: {1,1,1,1,1}
46: {1,9}
49: {4,4}
53: {16}
56: {1,1,1,4}
64: {1,1,1,1,1,1}
92: {1,1,9}
97: {25}
98: {1,4,4}
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MATHEMATICA
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Select[Range[100], And@@Cases[FactorInteger[#], {p_, _}:>IntegerQ[Sqrt[PrimePi[p]]]]&]
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CROSSREFS
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Cf. A001156, A011757, A033461, A052335, A056239, A062457, A078135, A112798, A117144, A118914, A276078.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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