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 A284891 Concatenation of the numbers from 3 to n. 1
 3, 34, 345, 3456, 34567, 345678, 3456789, 345678910, 34567891011, 3456789101112, 345678910111213, 34567891011121314, 3456789101112131415, 345678910111213141516, 34567891011121314151617, 3456789101112131415161718, 345678910111213141516171819 (list; graph; refs; listen; history; text; internal format)
 OFFSET 3,1 COMMENTS The a(3) = 3, a(19) = 345678910111213141516171819 are primes in this sequence (for n < 2800). LINKS Eric Weisstein's World of Mathematics, Consecutive Number Sequences CROSSREFS Cf. A089987, A262571. Sequence in context: A246384 A066265 A268802 * A231593 A134491 A045727 Adjacent sequences:  A284888 A284889 A284890 * A284892 A284893 A284894 KEYWORD base,nonn,easy AUTHOR XU Pingya, Apr 05 2017 STATUS approved

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Last modified January 21 01:45 EST 2022. Contains 350473 sequences. (Running on oeis4.)