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A103862 Numbers n such that the string 10000n is the decimal expansion of a prime number. 1
3, 33, 37, 39, 81, 99, 103, 121, 139, 141, 169, 189, 223, 229, 247, 253, 261, 271, 303, 339, 349, 357, 363, 379, 439, 451, 453, 457, 481, 511, 537, 583, 591, 609, 643, 651, 657, 667, 687, 691, 721, 723, 733, 741, 747, 759, 763, 769, 789, 799, 813, 819, 831 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms == 1 or 3 (mod 6). - Robert Israel, Mar 27 2018

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

EXAMPLE

3 is in the sequence because 100003 is prime.

81 is in the sequence because 1000081 is prime.

247 is in the sequence because 10000247 is prime.

MAPLE

select(n -> isprime(n+10^(ilog10(n)+5)), [seq(seq(6*i+j, j=[1, 3]), i=0..1000)]); # Robert Israel, Mar 27 2018

PROG

(MAGMA) [ n: n in [1..900] | IsPrime(Seqint(Intseq(n) cat [0, 0, 0, 0, 1])) ]; // Klaus Brockhaus, Feb 02 2011

CROSSREFS

Cf. A103601, A103602, A103603.

Sequence in context: A106413 A284064 A101968 * A180245 A084502 A248397

Adjacent sequences:  A103859 A103860 A103861 * A103863 A103864 A103865

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Mar 30 2005

STATUS

approved

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Last modified May 19 22:32 EDT 2019. Contains 323411 sequences. (Running on oeis4.)