A323558 Numbers k such that n^2 + n + k has no prime factor p <= 41 for any integer n.

19421, 27941, 55661, 72491, 237761, 333491, 514037, 546587, 553997, 601037, 619517, 635807, 685667, 712421, 843497, 849701, 871457, 916031, 994907, 1024691, 1049297, 1084607, 1084997, 1103777, 1165181, 1196927, 1211291, 1240697, 1262201, 1292231, 1342037, 1376591, 1384907, 1438751, 1454897, 1462577, 1488647

Offset: 1

Author

Jason Atwood, Jan 17 2019

Keywords

• nonn

Comments

Observation: The terms tend to be primes but are not by any means all primes.

If k is a term, then k + A002110(13) = k + 304250263527210 is also a term.

It appears this sequence includes about 1/2918.52 of the positive integers.