id:A166553 - OEIS Search Results

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a(n) = n-th Mersenne number + (n-1)-th triangular number.

+0
1

1, 4, 10, 21, 41, 78, 148, 283, 547, 1068, 2102, 4161, 8269, 16474, 32872, 65655, 131207, 262296, 524458, 1048765, 2097361, 4194534, 8388860, 16777491, 33554731, 67109188, 134218078, 268435833, 536871317, 1073742258, 2147484112 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = partial sums of A006127(n-1). a(n) = A000225(n) + A000217(n-1) = 2^n - 1 + (n * (n-1) / 2).`
	CROSSREFS	`Sequence in context: A001891 A121497 A132925 this_sequence A053643 A111927 A109885` `Adjacent sequences: A166550 A166551 A166552 this_sequence A166554 A166555 A166556`
	KEYWORD	`nonn`
	AUTHOR	`Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Oct 16 2009`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.

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