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A175102 1, followed by list of numbers n such that the number of strong primes and the number of weak primes are equal at the n-th prime. 3

%I #37 Apr 03 2023 10:36:12

%S 1,60,64,41192,41194,41247,41250,41252,41257,41259,41261,41263,41265,

%T 41267,41273,41275,41277,41279,41287,41317,41319,41321,41323,41325,

%U 41327,41328,41329,41335,41336,41338,41339,41341,41389,41393,41397,41399,41401,41404,41406,41408,41412,41444,41448,42112

%N 1, followed by list of numbers n such that the number of strong primes and the number of weak primes are equal at the n-th prime.

%C Also, indices of zeros in A092243. - _N. J. A. Sloane_, Mar 13 2016

%H N. J. A. Sloane and Chai Wah Wu, <a href="/A175102/b175102.txt">Table of n, a(n) for n = 1..20000</a>, terms for n = 1..446 from N. J. A. Sloane.

%H <a href="https://t5k.org/curios/page.php?curio_id=22821">Prime Curio for 281</a>

%o (PARI) c=1;q=3;r=2;s=0;forprime(p=5,default(primelimit),c++;(s+=sign(r+0-2*(r=q)+q=p))|print1(c", ")) \\ _M. F. Hasler_, Dec 03 2010

%Y Cf. A051634, A051635, A092243.

%K nonn

%O 1,2

%A _G. L. Honaker, Jr._, Dec 02 2010

%E More terms from _Chris K. Caldwell_

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Last modified April 28 05:00 EDT 2024. Contains 372020 sequences. (Running on oeis4.)