id:A104661 - OEIS Search Results

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Numbers n such that a semiprime is equal to the sum of n primes.

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2, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(4)=3 because 2+3+5 = 10 and 10 is a sempirime equal to 25;` `a(5)=4 because 2+2+5+5=14 and 14 is a semiprime equal to 27;` `a(6)=5 because 3+3+5+5+5=21 and 21 is a semprime equal to 3*7.`
	CROSSREFS	`Adjacent sequences: A104658 A104659 A104660 this_sequence A104662 A104663 A104664` `Sequence in context: A029074 A036016 A051918 this_sequence A029049 A094983 A015744`
	KEYWORD	`easy,nonn`
	AUTHOR	`Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Apr 22 2005`

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Last modified October 16 00:31 EDT 2008. Contains 145098 sequences.

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