id:A005521 - OEIS Search Results

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1 + (sum of first n odd primes - n)/2.

+0
3

1, 2, 4, 7, 12, 18, 26, 35, 46, 60, 75, 93, 113, 134, 157, 183, 212, 242, 275, 310, 346, 385, 426, 470, 518, 568, 619, 672, 726, 782, 845, 910, 978, 1047, 1121, 1196, 1274, 1355, 1438, 1524, 1613, 1703, 1798 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n+1) = a(n) + (prime(n+1) - 1)/2 for odd primes prime(n+1).`
	CROSSREFS	`a(n+1) - 1 counts primorial intervals A065917. a(n+2) - 2*a(n+1) + a(n) = A028334(n). - Frank.Ellermann(AT)t-online.de` `Sequence in context: A049631 A084672 A011910 this_sequence A135901 A124197 A011909` `Adjacent sequences: A005518 A005519 A005520 this_sequence A005522 A005523 A005524`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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