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

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Last modified December 7 08:24 EST 2022. Contains 358649 sequences. (Running on oeis4.)