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 A067533 n - number of divisors as well as n + number of divisors is a prime. 0
 5, 15, 27, 33, 57, 93, 105, 165, 177, 189, 231, 237, 245, 267, 275, 285, 345, 375, 393, 425, 453, 555, 567, 573, 597, 609, 637, 651, 687, 723, 833, 933, 1005, 1025, 1095, 1167, 1209, 1221, 1227, 1293, 1311, 1431, 1445, 1479, 1491, 1527, 1551, 1563, 1573 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Is the sequence finite.? LINKS EXAMPLE 57 is a term as d(57) = 4 and 57-4 =53 and 57+4 =61 both are primes. CROSSREFS Cf. A067531, A067532. Sequence in context: A147495 A147426 A100437 * A110343 A146060 A076843 Adjacent sequences:  A067530 A067531 A067532 * A067534 A067535 A067536 KEYWORD easy,nonn AUTHOR Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 17 2002 EXTENSIONS More terms from Sascha Kurz, Mar 19 2002 STATUS approved

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Last modified June 19 04:22 EDT 2013. Contains 226390 sequences.