A075378 Rearrangement of natural numbers with a(1) = 1, a(2n) squarefree and a(2n+1) not squarefree.

1, 2, 4, 3, 8, 5, 9, 6, 12, 7, 16, 10, 18, 11, 20, 13, 24, 14, 25, 15, 27, 17, 28, 19, 32, 21, 36, 22, 40, 23, 44, 26, 45, 29, 48, 30, 49, 31, 50, 33, 52, 34, 54, 35, 56, 37, 60, 38, 63, 39, 64, 41, 68, 42, 72, 43, 75, 46, 76, 47, 80, 51, 81, 53, 84, 55, 88, 57, 90, 58, 92, 59

Offset: 1

Author

Amarnath Murthy, Sep 22 2002

Keywords

• nonn

Programs

PARI

print1(1,",");p1=2;p2=4;for(i=2,100,if(i%2==0, while(!issquarefree(p1),p1++);print1(p1,",");p1++, while(issquarefree(p2),p2++);print1(p2,",");p2++)) - Lambert Herrgesell (zero815(AT)googlemail.com), Mar 09 2006

Extensions

More terms from Lambert Herrgesell (zero815(AT)googlemail.com), Mar 09 2006