A160785 - OEIS

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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

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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