cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A062409 Numbers k such that floor(e*k) is prime.

This page as a plain text file.
%I A062409 #21 Jun 02 2025 05:00:18
%S A062409 1,2,5,7,11,16,22,25,27,33,36,38,47,55,58,60,64,66,86,88,89,97,99,100,
%T A062409 102,108,113,122,124,128,130,141,155,163,172,192,205,216,227,228,236,
%U A062409 258,261,270,272,280,283,303,305,309,314,325,334,342,345,356,367,373
%N A062409 Numbers k such that floor(e*k) is prime.
%H A062409 Harry J. Smith, <a href="/A062409/b062409.txt">Table of n, a(n) for n = 1..1000</a>
%t A062409 Select[Range[400],PrimeQ[Floor[E #]]&] (* _Harvey P. Dale_, Feb 12 2015 *)
%o A062409 (PARI) je=[]; for(n=0,1000, if(isprime(floor(exp(1)*n)),je=concat(je,n),)); je
%o A062409 (PARI) { default(realprecision, 50); n=0; e=exp(1); for (m=1, 10^5, if (isprime(floor(e*m)), write("b062409.txt", n++, " ", m); if (n==1000, break)) ) } \\ _Harry J. Smith_, Aug 07 2009
%Y A062409 Cf. A022843, A077545.
%K A062409 nonn
%O A062409 1,2
%A A062409 _Jason Earls_, Jul 08 2001