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A279204 Numbers whose decimal expansion is a concatenation of 4 consecutive increasing nonnegative numbers. 5
1234, 2345, 3456, 4567, 5678, 6789, 78910, 891011, 9101112, 10111213, 11121314, 12131415, 13141516, 14151617, 15161718, 16171819, 17181920, 18192021, 19202122, 20212223, 21222324, 22232425, 23242526, 24252627, 25262728, 26272829, 27282930, 28293031, 29303132, 30313233, 31323334 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes in this sequence are: 4567, 14151617, 20212223, 34353637, 58596061, 64656667, ... Are there infinitely many primes in the sequence? - Chai Wah Wu, Dec 17 2016

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000

PROG

(Python)

def A279204(n):

    return int(str(n)+str(n+1)+str(n+2)+str(n+3)) # Chai Wah Wu, Dec 17 2016

CROSSREFS

For concatenations of exactly k consecutive integers see A000027(k=1), A127421 (k=2), A001703 (k=3), A279204 (k=4). For 2 or more see A035333.

Sequence in context: A055616 A104971 A193492 * A091332 A210515 A122043

Adjacent sequences:  A279201 A279202 A279203 * A279205 A279206 A279207

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Dec 17 2016

STATUS

approved

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Last modified October 25 11:07 EDT 2021. Contains 348239 sequences. (Running on oeis4.)