

A169606


a(2n1) = prime(n+2)3, a(2n) = prime(n+2)2.


2



2, 3, 4, 5, 8, 9, 10, 11, 14, 15, 16, 17, 20, 21, 26, 27, 28, 29, 34, 35, 38, 39, 40, 41, 44, 45, 50, 51, 56, 57, 58, 59, 64, 65, 68, 69, 70, 71, 76, 77, 80, 81, 86, 87, 94, 95, 98, 99, 100, 101, 104, 105, 106, 107, 110, 111, 124, 125, 128, 129, 134, 135, 136, 137, 146
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OFFSET

1,1


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..1000


FORMULA

a(n) ~ 0.5 n log n.  Charles R Greathouse IV, May 25 2011


EXAMPLE

a(1)=53=2; a(2)=52=3; a(3)=73=4.


MATHEMATICA

Table[If[OddQ[n], Prime[(n+1)/2+2]3, Prime[n/2+2]2], {n, 70}] (* Harvey P. Dale, Oct 25 2020 *)


PROG

(PARI) forprime(p=5, 97, print1(p3", "p2", ")) \\ Charles R Greathouse IV, May 25 2011


CROSSREFS

Cf. A047247, A000040.
Sequence in context: A068406 A276878 A047247 * A140769 A032877 A032844
Adjacent sequences: A169603 A169604 A169605 * A169607 A169608 A169609


KEYWORD

nonn,easy


AUTHOR

JuriStepan Gerasimov, Dec 03 2009


EXTENSIONS

Entries checked by R. J. Mathar, Apr 14 2010
Definition reworded by N. J. A. Sloane, Aug 24 2012


STATUS

approved



