A070330 - OEIS

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A070330

Nontrivial numbers in which suffixing or inserting a 0 anywhere yields only composite numbers.

1

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

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

"Nontrivial" excludes multiples of 2, 3, or 5.

LINKS

Table of n, a(n) for n=1..55.

CROSSREFS

Cf. A002808, A070331.

Cf. A008585, A005843, A017329.

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

a(1)=1 inserted by Sean A. Irvine, Jun 08 2024

STATUS

approved