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A287244 Indices n for which concatenation of the numbers from n to n + 9 is prime. 1
4, 20, 68, 88, 122, 140, 188, 200, 212, 220, 224, 244, 254, 374, 460, 490, 502, 518, 550, 568, 632, 688, 734, 814, 832, 884, 898, 908, 928, 982, 1022, 1108, 1472, 1490, 1498, 1514, 1544, 1580, 1894, 1954, 2074, 2230, 2294, 2384, 2492, 2524, 2722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..47.

F. Smarandache, Sequences of Numbers Involved in Unsolved Problems.

Eric Weisstein's World of Mathematics, Smarandache Sequences

EXAMPLE

a(1) = 4, since 45678910111213 is prime.

MATHEMATICA

Position[Map[FromDigits@ Flatten@ IntegerDigits@ # &, Partition[Range@ 2800, 10, 1]], p_ /; PrimeQ@ p][[All, 1]] (* Michael De Vlieger, May 22 2017 *)

CROSSREFS

Cf. A030458.

Sequence in context: A055538 A302317 A319779 * A344993 A123613 A006740

Adjacent sequences:  A287241 A287242 A287243 * A287245 A287246 A287247

KEYWORD

base,easy,nonn

AUTHOR

XU Pingya, May 22 2017

STATUS

approved

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Last modified May 17 10:16 EDT 2022. Contains 353745 sequences. (Running on oeis4.)