id:A065221 - OEIS Search Results

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Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the pentagonal numbers. The final elements of the rows form a(n).

+0
14

1, 2, 5, 4, 9, 3, 10, 18, 5, 15, 26, 3, 16, 30, 45, 10, 27, 45, 64, 14, 35, 57, 80, 12, 37, 63, 90, 1, 30, 60, 91, 123, 11, 45, 80, 116, 153, 15, 54, 94, 135, 177, 10, 54, 99, 145, 192, 240, 42, 92, 143, 195, 248, 15, 70, 126, 183, 241, 300, 30, 91, 153, 216, 280, 345, 35 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`The array begins` `....1` `...1.2` `..3.4.5` `.1.2.3.4` `5.6.7.8.9`
	CROSSREFS	`Cf. A064766, A064865, A065222-A065234.` `Sequence in context: A033686 A134079 A080031 this_sequence A114752 A123302 A120119` `Adjacent sequences: A065218 A065219 A065220 this_sequence A065222 A065223 A065224`
	KEYWORD	`easy,nonn`
	AUTHOR	`Floor van Lamoen (fvlamoen(AT)hotmail.com), Oct 22 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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