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A073037 Take A000040, omit commas: 23571113171923..., select 4-digit primes seen when scanning from left. 0
2357, 3571, 5711, 3137, 7717, 8389, 1103, 1031, 7109, 1091, 911, 2713, 9151, 1511, 1571, 3167, 9181, 1811, 1193, 1931, 9319, 9719, 1223, 7229, 3323, 9241, 7127, 1277, 1283, 8329, 3307, 1733, 7331, 3313, 3373, 7349, 3533, 3359, 3593, 3673, 6737, 3733 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..42.

EXAMPLE

In the sequence 2357111317192329... (primes without delimiters) 4-digit primes are: 2357, 3571, 5711, 3137, 7717, ...

MATHEMATICA

p200=Flatten[IntegerDigits[Prime[Range[200]]]]; n=4; (* n-digit primes!*) pn=Partition[p200, n, 1]; ln=Length[pn]; tab=Table[Sum[10^(n-k)*pn[[i, k]], {k, n}], {i, ln}]; Select[tab, PrimeQ]

FromDigits/@Select[Partition[Flatten[IntegerDigits[Prime[Range[100]]]], 4, 1], PrimeQ[FromDigits[#]]&] (* Harvey P. Dale, Mar 21 2013 *)

CROSSREFS

Sequence in context: A346940 A134966 A108419 * A160403 A156987 A101251

Adjacent sequences: A073034 A073035 A073036 * A073038 A073039 A073040

KEYWORD

easy,nonn,base

AUTHOR

Zak Seidov, Aug 22 2002

STATUS

approved

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Last modified December 3 01:25 EST 2022. Contains 358510 sequences. (Running on oeis4.)