

A141409


Prime numbers that cannot be formed by the concatenation of previous terms.


6



2, 3, 5, 7, 11, 13, 17, 19, 29, 31, 41, 43, 47, 59, 61, 67, 71, 79, 83, 89, 97, 101, 103, 107, 109, 127, 131, 139, 149, 151, 157, 163, 167, 179, 181, 191, 199, 223, 227, 233, 239, 251, 263, 269, 277, 281, 307, 337, 349, 353, 373, 401, 409, 419, 421, 431, 439, 443, 449, 457, 461
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OFFSET

1,1


COMMENTS

Previous terms can appear in any order but can be used at most once.  Paolo P. Lava, Mar 04 2010


LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000
David A. Corneth, PARI program


EXAMPLE

137 is not in the sequence because 13  7 > 137;
797 is not in the sequence because 7  97 or 79  7 > 797.
257 is not in the sequence because 2  5  7 = 257 where  denotes concatenation.  David A. Corneth, Jan 23 2022


PROG

(PARI) See Corneth link \\ David A. Corneth, Jan 23 2022


CROSSREFS

Cf. A141033.
Sequence in context: A092570 A133956 A176164 * A238647 A348358 A171821
Adjacent sequences: A141406 A141407 A141408 * A141410 A141411 A141412


KEYWORD

nonn,easy,base


AUTHOR

Paolo P. Lava and Giorgio Balzarotti, Aug 04 2008, Aug 28 2008, Mar 04 2010


EXTENSIONS

Offset changed to 1 and data corrected by David A. Corneth, Jan 23 2022


STATUS

approved



