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A141409 Prime numbers that cannot be formed by the concatenation of previous terms. 4
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, 257, 263, 269, 277, 281, 307, 337, 349, 353, 373, 401, 409, 419, 421, 431, 439, 443, 449, 457, 461 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

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

LINKS

Table of n, a(n) for n=0..61.

EXAMPLE

137 is not in the sequence because 13 U 7 -> 137

797 is not in the sequence because 7 U 97 or 79 U 7 -> 797

CROSSREFS

Cf. A141033.

Sequence in context: A092570 A133956 A176164 * A238647 A171821 A004051

Adjacent sequences:  A141406 A141407 A141408 * A141410 A141411 A141412

KEYWORD

easy,nonn,base

AUTHOR

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

STATUS

approved

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Last modified March 28 02:40 EDT 2017. Contains 284182 sequences.