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

1,2

Links

Table of n, a(n) for n=1..72.

Prog

(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

Crossrefs

Sequence in context: A246365 A331585 A191729 * A101905 A297075 A306458

Adjacent sequences: A075375 A075376 A075377 * A075379 A075380 A075381

Keyword

nonn

Author

Amarnath Murthy, Sep 22 2002

Extensions

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

Status

approved