id:A085107 - OEIS Search Results

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Starting with n-1 go on adding the numbers less than n and coprime to it in descending order until one gets a prime. a(n) = this prime, or 0 if no such number exists.

+0
1

0, 0, 2, 3, 7, 5, 11, 7, 0, 19, 19, 11, 23, 13, 53, 0, 31, 17, 0, 19, 0, 101, 43, 23, 47, 131, 0, 139, 0, 29, 59, 31, 233, 223, 67, 179, 71, 37, 373, 109, 79, 41, 83, 43, 269, 457, 0, 47, 431, 139, 641, 313, 103, 53, 107, 251, 613, 643, 0, 59, 0, 61, 587, 0, 127, 521, 131, 67 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(p+1) = p, p is a prime.` `If n is prime and 2n-3 is not prime, then a(n) = 0. - David Wasserman (wasserma(AT)spawar.navy.mil), Jan 27 2005`
	EXAMPLE	`a(10) = 9 + 7 + 3 = 19.`
	CROSSREFS	`Sequence in context: A045790 A085102 A087572 this_sequence A034694 A050921 A087386` `Adjacent sequences: A085104 A085105 A085106 this_sequence A085108 A085109 A085110`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), Jul 04 2003`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jan 27 2005`

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

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