A135720 a(n) is the smallest Carmichael number (A002997) with the n-th prime as its smallest prime divisor, or 0 if no such number exists.
561, 1105, 1729, 75361, 29341, 162401, 334153, 1615681, 3581761, 399001, 294409, 252601, 1152271, 104569501, 2508013, 178837201, 6189121, 10267951, 10024561, 14469841, 4461725581, 985052881, 19384289, 23382529, 3828001, 90698401, 84350561, 6733693, 17098369
Offset: 2
Keywords
Examples
a(2) = 561 because the smallest prime divisor of 561 is 3 which is the second prime.
Links
- Amiram Eldar, Table of n, a(n) for n = 2..1383 (calculated using data from Claude Goutier; terms 2..447 from Donovan Johnson, terms 448..615 from Max Alekseyev)
- Claude Goutier, Compressed text file carm10e22.gz containing all the Carmichael numbers up to 10^22.
- Index entries for sequences related to Carmichael numbers.
Extensions
Two missing terms and terms up to a(447) added by Donovan Johnson, Dec 25 2013
a(448)-a(615) in b-file from Max Alekseyev, Mar 11 2018
Escape clause added by Jianing Song, Dec 12 2021