id:A071179 - OEIS Search Results

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n - (sum of prime factors of n) is prime.

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4, 10, 12, 14, 15, 18, 20, 21, 24, 26, 28, 33, 35, 36, 38, 39, 44, 45, 48, 50, 51, 52, 56, 62, 63, 65, 69, 72, 75, 77, 80, 86, 91, 92, 93, 95, 98, 104, 108, 111, 112, 117, 122, 123, 129, 133, 135, 144, 146, 147, 148, 152, 159, 161, 162, 171, 172, 175, 176, 188, 189 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`20 = 2^2.5 and 20-(2+5) = 13 is prime hence 20 is in the sequence`
	PROGRAM	`(PARI) for(n=1, 100, if(isprime(n-sumdiv(n, d, isprime(d)*d))==1, print1(n, ", ")))`
	CROSSREFS	`Sequence in context: A078005 A092428 A102998 this_sequence A155475 A023693 A077654` `Adjacent sequences: A071176 A071177 A071178 this_sequence A071180 A071181 A071182`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Jun 10 2002`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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