

A189562


Irregular triangle in which row n has even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).


3



2, 4, 6, 8, 10, 12, 14, 18, 20, 28, 38, 16, 22, 26, 30, 40, 52, 62, 68, 98, 24, 32, 34, 36, 42, 44, 46, 50, 56, 58, 88, 122, 128, 54, 64, 70, 74, 76, 82, 86, 94, 104, 136, 148, 152, 158, 48, 66, 80, 92, 100, 106, 110, 116, 118, 124, 134, 146, 164, 166, 172, 182
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OFFSET

0,1


COMMENTS

The length of row n is A189561(n). The first term in row n is A189558(n).


REFERENCES

See A003415.


LINKS

T. D. Noe, Rows n = 0..250, flattened


FORMULA

Row n has even numbers k such that A099302(k) = n.


EXAMPLE

The triangle begins:
2
4, 6, 8
10, 12, 14, 18, 20, 28, 38
16, 22, 26, 30, 40, 52, 62, 68, 98
24, 32, 34, 36, 42, 44, 46, 50, 56, 58, 88, 122, 128
54, 64, 70, 74, 76, 82, 86, 94, 104, 136, 148, 152, 158
48, 66, 80, 92, 100, 106, 110, 116, 118, 124, 134, 146, 164, 166, 172, 182


CROSSREFS

Cf. A003415, A099302, A189561.
Sequence in context: A321501 A238264 A098807 * A194372 A058218 A264986
Adjacent sequences: A189559 A189560 A189561 * A189563 A189564 A189565


KEYWORD

nonn,tabf


AUTHOR

T. D. Noe, Apr 24 2011


STATUS

approved



