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A358136
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Irregular triangle read by rows whose n-th row lists the partial sums of the prime indices of n (row n of A112798).
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30
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1, 2, 1, 2, 3, 1, 3, 4, 1, 2, 3, 2, 4, 1, 4, 5, 1, 2, 4, 6, 1, 5, 2, 5, 1, 2, 3, 4, 7, 1, 3, 5, 8, 1, 2, 5, 2, 6, 1, 6, 9, 1, 2, 3, 5, 3, 6, 1, 7, 2, 4, 6, 1, 2, 6, 10, 1, 3, 6, 11, 1, 2, 3, 4, 5, 2, 7, 1, 8, 3, 7, 1, 2, 4, 6, 12, 1, 9, 2, 8, 1, 2, 3, 6, 13
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OFFSET
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2,2
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COMMENTS
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A prime index of n is a number m such that prime(m) divides n. The multiset of prime indices of n is row n of A112798.
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LINKS
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EXAMPLE
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Triangle begins:
2: 1
3: 2
4: 1 2
5: 3
6: 1 3
7: 4
8: 1 2 3
9: 2 4
10: 1 4
11: 5
12: 1 2 4
13: 6
14: 1 5
15: 2 5
16: 1 2 3 4
17: 7
18: 1 3 5
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MATHEMATICA
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primeMS[n_]:=If[n==1, {}, Flatten[Cases[FactorInteger[n], {p_, k_}:>Table[PrimePi[p], {k}]]]];
Table[Accumulate[primeMS[n]], {n, 30}]
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CROSSREFS
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First element in each row is A055396.
Last element in each row is A056239.
Rows are the partial sums of rows of A112798.
Sorted Heinz numbers of the rows are A325362.
The version for standard compositions is A358134.
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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