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 A073065 a(n) = prime(n) * prime(prime(n)). 2
 6, 15, 55, 119, 341, 533, 1003, 1273, 1909, 3161, 3937, 5809, 7339, 8213, 9917, 12773, 16343, 17263, 22177, 25063, 26791, 31679, 35773, 41029, 49373, 55247, 57989, 62809, 65291, 69721, 90043, 96809, 105901, 110783, 127991, 132427, 144283, 157621, 165497 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE Prime numbers are 2,3,5,7,11,13,17,... 2nd prime is 3, 3rd prime is 5 and the 5th prime is 11, so we get 2*3=6, 3*5=15, 5*11=55... MATHEMATICA #*Prime[#]&/@Prime[Range[40]] (* Harvey P. Dale, Jun 24 2018 *) PROG (PARI) a(n) = prime(n) * prime(prime(n)) \\ Michel Marcus, Jun 26 2013 CROSSREFS Cf. A000040, A073136. Sequence in context: A122365 A262912 A119132 * A190801 A093042 A270624 Adjacent sequences:  A073062 A073063 A073064 * A073066 A073067 A073068 KEYWORD easy,nonn AUTHOR Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002 STATUS approved

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Last modified April 16 12:45 EDT 2021. Contains 343037 sequences. (Running on oeis4.)