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A067531
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n - number of divisors is a prime.
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2
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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; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Larger of the twin primes is a term.
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EXAMPLE
| 51 is a term as d(51) = 4 and 51-4 =47 is a prime.
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MAPLE
| with(numtheory): for n from 3 to 500 do if isprime(n-tau(n)) then printf(`%d, `, n) fi:od:
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CROSSREFS
| Sequence in context: A003273 A006991 A047574 * A031029 A134985 A111018
Adjacent sequences: A067528 A067529 A067530 * A067532 A067533 A067534
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KEYWORD
| easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 17 2002
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EXTENSIONS
| More terms and Maple code from James A. Sellers (sellersj(AT)math.psu.edu), Feb 18, 2002
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