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 A113030 Largest prime arising that can be formed by stringing together the decimal expansions of some or all of the first n numbers in some order. 0
 2, 31, 4231, 5431, 65423, 7652413, 8765423, 98765431, 10987653421, 111098765423, 12111098765413, 13121110987654231, 141312111098765213, 15141312111098763241, 16151413121110987654213, 171615141312111098764523 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS EXAMPLE a(3) = 31 as 321 or any other three digit permutation is not a prime and 23 < 31. Any permutation of all or a few of the first five numbers 1,2,3,4,5,gives the largest prime 5431. Hence a(5) = 5431. MATHEMATICA for 4

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Last modified January 18 21:54 EST 2019. Contains 319282 sequences. (Running on oeis4.)