id:A067531 - OEIS Search Results

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n - number of divisors is a prime.

+0
3

5, 6, 7, 13, 15, 16, 19, 21, 27, 31, 33, 35, 43, 51, 57, 61, 65, 73, 77, 87, 93, 103, 105, 109, 111, 135, 139, 141, 143, 151, 155, 161, 165, 177, 181, 183, 185, 189, 193, 199, 201, 203, 215, 229, 231, 237, 241, 245, 267, 271, 275, 283, 285, 287, 313, 321, 335 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Larger of the twin primes is a term.`
	EXAMPLE	`51 is a term as d(51) = 4 and 51-4 =47 is a prime.`
	MAPLE	with(numtheory): for n from 3 to 500 do if isprime(n-tau(n)) then printf(`%d, `, n) fi:od:
	CROSSREFS	`Sequence in context: A003273 A006991 A047574 this_sequence A031029 A134985 A111018` `Adjacent sequences: A067528 A067529 A067530 this_sequence A067532 A067533 A067534`
	KEYWORD	`easy,nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 17 2002`
	EXTENSIONS	`More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 18, 2002`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

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