cp's OEIS Frontend

A227069 Irregular triangle of n-primes p such that the number of even n-primes (<= p) equals the number of odd n-primes (<= p).

%I A227069 #13 Aug 13 2013 20:11:46
%S A227069 3,51,62,32151,32158,32163,32170,300863849741,300863849758,
%T A227069 300863849763,300863849817,300863849841,300863849864,300863849871,
%U A227069 300863851617,300863851626,300863852542,300863852547,300863852565,300863852571,300863852799,300863852805
%N A227069 Irregular triangle of n-primes p such that the number of even n-primes (<= p) equals the number of odd n-primes (<= p).
%C A227069 An n-prime is a number having n prime factors (counted multiply). For any n, the ratio of even n-primes to odd n-primes tends to decrease with the magnitude of the numbers.
%H A227069 Donovan Johnson, <a href="/A227069/b227069.txt">Rows n = 1..4, flattened</a>
%e A227069 The irregular triangle begins:
%e A227069 3;
%e A227069 51, 62;
%e A227069 32151, 32158, 32163, 32170;
%e A227069 300863849741, 300863849758, 300863849763, 300863849817, 300863849841, 300863849864, 300863849871, 300863851617, 300863851626, 300863852542, 300863852547, 300863852565, 300863852571, 300863852799, 300863852805, 300863852811, 300863852821, 300863852829, 300863852841, 300863852863, 300863852893, 300863852927, 300863852930, 300863853102, 300863853114, 300863853121, 300863855609, 300863855612, 300863855822, 300863855848, 300863855971, 300863856014, 300863856134, 300863856142, 300863856146, 300863856148, 300863856356, 300863856435;
%Y A227069 Cf. A227067 (first term of each row).
%K A227069 nonn,hard,tabf
%O A227069 1,1
%A A227069 _T. D. Noe_, Aug 05 2013
%E A227069 Row 4 from _Donovan Johnson_, Aug 13 2013