A143204 Union of A143207 and A033847.

14, 28, 30, 56, 60, 90, 98, 112, 120, 150, 180, 196, 224, 240, 270, 300, 360, 392, 448, 450, 480, 540, 600, 686, 720, 750, 784, 810, 896, 900, 960, 1080, 1200, 1350, 1372, 1440, 1500, 1568, 1620, 1792, 1800, 1920, 2160, 2250, 2400, 2430, 2700, 2744, 2880

Offset

1,1

Comments

A143201(a(n)) = 6. Subsequence of A195238. - Harvey P. Dale, Sep 13 2011

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Example

a(1)  =  14 = 2 * 7 = A033847(1);
a(2)  =  28 = 2^2 * 7 = A033847(2);
a(3)  =  30 = 2 * 3 * 5 = A143207(1);
a(4)  =  56 = 2^3 * 7 = A033847(3);
a(5)  =  60 = 2^2 * 3 * 5 = A143207(2);
a(6)  =  90 = 2 * 3^2 * 5 = A143207(3);
a(7)  =  98 = 2 * 7^2 = A033847(4);
a(8)  = 112 = 2^4 * 7 = A033847(5);
a(9)  = 120 = 2^3 * 3 * 5 = A143207(4);
a(10) = 150 = 2 * 3 * 5^2 = A143207(5);
a(11) = 180 = 2^2 * 3^2 * 5 = A143207(6);
a(12) = 196 = 2^2 * 7^2 = A033847(6).

Crossrefs

Sequence in context: A296755 A297282 A095782 * A276525 A118904 A164722

Adjacent sequences: A143201 A143202 A143203 * A143205 A143206 A143207

Keyword

nonn

Author

Reinhard Zumkeller, Aug 12 2008

Extensions

Corrected by Harvey P. Dale, Aug 21 2011

Revised version with improved definition; thanks to Harvey P. Dale who noticed that the original definition was not sufficient.

Status

approved