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 A098027 Smallest prime p such that p+2 is a product of exactly n distinct primes. 0
 3, 13, 103, 1153, 15013, 255253, 4849843, 111546433, 4360010653, 100280245063, 5245694198743, 152125131763603, 7149881192889433, 421842990380476663, 16294579238595022363, 1106494163767990292293, 74135108972455349583763 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS In most cases a(n) = pn! - 2, where pn! is "factorial of odd primes": from 3 to n-th odd prime. - Zak Seidov - Zak Seidov and Don Reble, Mar 10 2006 LINKS EXAMPLE 3+2=5 (1 prime), 13+2=15=3*5 (2 primes), 103+2=105=3*5*7 (3 primes), ... 1153 is the 4th entry in the sequence because it is followed by primes 1783, 1993, 2143, 2803, ... with the property 1153+2 = 3*5*7*11, 1783+2 = 3*5*7*17, 1993+2 = 3*5*7*19, 2143+2 = 3*5*11*13, 2803+2 = 3*5*11*17, ... CROSSREFS Cf. A067024 [From R. J. Mathar, Sep 02 2008] Sequence in context: A068168 A215126 A228148 * A182104 A073587 A337869 Adjacent sequences:  A098024 A098025 A098026 * A098028 A098029 A098030 KEYWORD nonn AUTHOR Lekraj Beedassy, Sep 10 2004 EXTENSIONS Extended by Ray Chandler, Sep 18 2004 More terms from Zak Seidov and Don Reble, Mar 10 2006 Corrected by Don Reble, Apr 03 2006 STATUS approved

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Last modified August 13 07:13 EDT 2022. Contains 356078 sequences. (Running on oeis4.)