A119889 Prime soloist : prime number which is no member of any prime ensemble.
3, 13, 17, 19, 31, 37, 53, 59, 67, 71, 73, 79, 89, 97, 103, 107, 109, 127, 139, 149, 157, 163, 167, 179, 181, 193, 197, 199, 211, 229, 233, 239, 251, 257, 269, 271, 277, 283, 293, 307, 337, 347, 349, 359, 367, 373, 379, 383, 389, 397, 409, 419, 431, 433, 439
Offset: 1
Examples
17 is in the sequence because the sum of the digits (8) is a composite number. 449 is in the sequence because the sum of the digits (17) is another prime soloist.
Links
- L. Stevens, Prime ensembles
Extensions
Corrected by T. D. Noe, Oct 25 2006