A070330 Nontrivial numbers in which suffixing or inserting a 0 anywhere yields only composite numbers.
1, 7, 23, 29, 31, 43, 47, 73, 77, 83, 91, 101, 103, 107, 127, 143, 157, 173, 199, 209, 221, 233, 241, 247, 251, 257, 259, 271, 307, 313, 317, 343, 353, 359, 373, 377, 391, 409, 431, 433, 437, 439, 443, 461, 467, 469, 487, 497, 527, 541, 563, 569, 583, 589, 601
Offset: 1
Extensions
More terms from Sascha Kurz, Feb 01 2003
a(1)=1 inserted by Sean A. Irvine, Jun 08 2024
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