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A070330 Nontrivial numbers in which suffixing or inserting a 0 anywhere yields only composite numbers. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

This excludes numbers with sum of the digits == 0 mod 3, even numbers, or numbers == 5 (mod 10).

LINKS

Table of n, a(n) for n=0..53.

CROSSREFS

Cf. A070331.

Sequence in context: A031116 A044068 A109992 * A095314 A038948 A019389

Adjacent sequences:  A070327 A070328 A070329 * A070331 A070332 A070333

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, May 11 2002

EXTENSIONS

More terms from Sascha Kurz, Feb 01 2003

STATUS

approved

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Last modified June 14 14:07 EDT 2021. Contains 345025 sequences. (Running on oeis4.)