id:A085273 - OEIS Search Results

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Difference between n-th composite number and its largest prime divisor.

+0
3

2, 3, 6, 6, 5, 9, 7, 10, 14, 15, 15, 14, 11, 21, 20, 13, 24, 21, 25, 30, 22, 17, 28, 33, 19, 26, 35, 35, 33, 40, 23, 45, 42, 45, 34, 39, 51, 44, 49, 38, 29, 55, 31, 56, 62, 52, 55, 51, 46, 63, 69, 37, 70, 57, 66, 65, 75, 78, 41, 77, 68, 43, 58, 77, 85, 78, 69, 62, 47, 76, 93, 91 (list; graph; listen)

	OFFSET	`4,1`
	EXAMPLE	`For 91=713 we have 91-13 = 78` `For 92=22*23 we have 92-23 = 69`
	PROGRAM	`(PARI) cminusp2(n) = { for(x=2, n, forstep(p=x, 2, -1, if(isprime(p) & x%p==0 & isprime(x)==0, print1(x-p, ", "); break); ) ) }`
	CROSSREFS	`Cf. A085271.` `Sequence in context: A102402 A124498 A113399 this_sequence A151850 A078706 A077082` `Adjacent sequences: A085270 A085271 A085272 this_sequence A085274 A085275 A085276`
	KEYWORD	`easy,nonn`
	AUTHOR	`Cino Hilliard (hillcino368(AT)gmail.com), Aug 12 2003`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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