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A227069 Irregular triangle of n-primes p such that the number of even n-primes (<= p) equals the number of odd n-primes (<= p). 2
3, 51, 62, 32151, 32158, 32163, 32170, 300863849741, 300863849758, 300863849763, 300863849817, 300863849841, 300863849864, 300863849871, 300863851617, 300863851626, 300863852542, 300863852547, 300863852565, 300863852571, 300863852799, 300863852805 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 17 11:03 EDT 2019. Contains 327129 sequences. (Running on oeis4.)