A073065 a(n) = prime(n) * prime(prime(n)).

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

Offset

1,1

Links

Table of n, a(n) for n=1..39.

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 A373569

Adjacent sequences: A073062 A073063 A073064 * A073066 A073067 A073068

Keyword

easy,nonn

Author

Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002

Status

approved