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

3, 51, 62, 32151, 32158, 32163, 32170, 300863849741, 300863849758, 300863849763, 300863849817, 300863849841, 300863849864, 300863849871, 300863851617, 300863851626, 300863852542, 300863852547, 300863852565, 300863852571, 300863852799, 300863852805

Offset

1,1

Comments

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.

Links

Donovan Johnson, Rows n = 1..4, flattened

Example

The irregular triangle begins:
3;
51, 62;
32151, 32158, 32163, 32170;
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;

Crossrefs

Cf. A227067 (first term of each row).

Sequence in context: A305449 A304701 A316452 * A062216 A305012 A316173

Adjacent sequences: A227066 A227067 A227068 * A227070 A227071 A227072

Keyword

nonn,hard,tabf

Author

T. D. Noe, Aug 05 2013

Extensions

Row 4 from Donovan Johnson, Aug 13 2013

Status

approved