A160785 Even squarefree numbers plus 1.

3, 7, 11, 15, 23, 27, 31, 35, 39, 43, 47, 59, 63, 67, 71, 75, 79, 83, 87, 95, 103, 107, 111, 115, 119, 123, 131, 135, 139, 143, 147, 155, 159, 167, 171, 175, 179, 183, 187, 191, 195, 203, 207, 211, 215, 219, 223, 227, 231, 239, 247, 255, 259, 263, 267, 275, 279

Offset

1,1

Links

Table of n, a(n) for n=1..57.

Formula

a(n) = A039956(n) + 1.

Example

10 is an even squarefree number, so 11 is in this list.

Maple

with(numtheory): a := proc (n) if issqrfree(2*n) = true then 2*n+1 else end if end proc: seq(a(n), n = 1 .. 150); # Emeric Deutsch, Jun 20 2009

Crossrefs

Cf. A005117.

Sequence in context: A165197 A246559 A246521 * A095100 A036994 A243115

Adjacent sequences: A160782 A160783 A160784 * A160786 A160787 A160788

Keyword

easy,nonn

Author

Ben Paul Thurston, May 26 2009

Extensions

More terms from Emeric Deutsch, Jun 20 2009

Status

approved