id:A072194 - OEIS Search Results

Search: id:A072194

Displaying 1-1 of 1 results found.

page 1

Replace all prime factors p of n by n-p.

+0
1

1, 0, 0, 4, 0, 12, 0, 216, 36, 40, 0, 900, 0, 84, 120, 38416, 0, 3600, 0, 4860, 252, 220, 0, 223608, 400, 312, 13824, 14196, 0, 18900, 0, 24300000, 660, 544, 840, 1258884, 0, 684, 936, 1920520, 0, 54600, 0, 58212, 70560, 1012, 0, 201485520, 1764, 97200 (list; graph; listen)

	OFFSET	`1,4`
	COMMENT	`a(n)=0 iff n is prime.`
	EXAMPLE	`a(18)=a(233)=(18-2)(18-3)(18-3)=161515=3600.`
	CROSSREFS	`Sequence in context: A019207 A167296 A147607 this_sequence A151921 A141554 A076600` `Adjacent sequences: A072191 A072192 A072193 this_sequence A072195 A072196 A072197`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 02 2002`

page 1

Search completed in 0.002 seconds

Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

AT&T Labs Research