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A180450 Primes of the form floor( (n^sqrt(2) + n)/sqrt(2) ). 1
3, 5, 7, 13, 19, 43, 67, 71, 89, 103, 107, 127, 137, 163, 191, 311, 317, 337, 383, 397, 431, 547, 569, 577, 599, 607, 653, 661, 677, 701, 709, 733, 757, 823, 857, 977, 1021, 1039, 1129, 1193, 1249, 1277, 1381, 1459, 1699, 1709, 1823, 1949, 2099, 2131, 2153, 2521, 2647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Intersection of A000040 with the sequence 1, 3, 5, 7, 10, 13, 16, 19, 22, 25, 28, 32, 35, ... defined by the floor function.

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

MAPLE

select(isprime, [seq(floor((n^sqrt(2)+n)/sqrt(2)), n=1..350)]); # Muniru A Asiru, Sep 29 2018

MATHEMATICA

Select[With[{b = Sqrt[2]}, Table[Floor[(n^b + n)/b], {n, 500}]], PrimeQ] (* G. C. Greubel, Sep 29 2018 *)

PROG

(PARI) for(n=1, 148438, if(ispseudoprime(t=floor((n^sqrt(2)+n)/sqrt(2))), print1(t", "))); v \\ Charles R Greathouse IV, Feb 18 2011

CROSSREFS

Sequence in context: A330222 A154700 A187872 * A051507 A173145 A060274

Adjacent sequences:  A180447 A180448 A180449 * A180451 A180452 A180453

KEYWORD

easy,nonn

AUTHOR

William A. Tedeschi, Sep 07 2010

EXTENSIONS

Formula replaced by a comment - R. J. Mathar, Sep 09 2010

STATUS

approved

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Last modified April 16 11:10 EDT 2021. Contains 343037 sequences. (Running on oeis4.)