id:A062198 - OEIS Search Results

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Sum of first n semiprimes.

+0
5

4, 10, 19, 29, 43, 58, 79, 101, 126, 152, 185, 219, 254, 292, 331, 377, 426, 477, 532, 589, 647, 709, 774, 843, 917, 994, 1076, 1161, 1247, 1334, 1425, 1518, 1612, 1707, 1813, 1924, 2039, 2157, 2276, 2397, 2519, 2642, 2771, 2904, 3038, 3179, 3321, 3464 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Elements in this sequence can themselves be semiprimes. a(1) = 4 = 2^2. a(2) = 10 = 2 * 5. a(6) = 58 = 2 * 29. a(11) = 185 = 5 * 37. a(12) = 219 = 3 * 73. a(13) = 254 = 2 * 127. a(16) = 377 = 13 * 29. a(20) = 589 = 19 * 31. Etc. Does this happen infinitely often? - - Jonathan Vos Post (jvospost2(AT)yahoo.com), Dec 11 2004`
	EXAMPLE	`a(4)=29 because sum of first 4 semiprimes i.e. 4+6+9+10 is 29.`
	CROSSREFS	`Sequence in context: A009912 A073262 A029714 this_sequence A050858 A022785 A057312` `Adjacent sequences: A062195 A062196 A062197 this_sequence A062199 A062200 A062201`
	KEYWORD	`easy,nonn`
	AUTHOR	`Shyam Sunder Gupta (guptass(AT)rediffmail.com), Aug 24 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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