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A160785 Even squarefree numbers plus 1. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified April 19 04:19 EDT 2019. Contains 322237 sequences. (Running on oeis4.)