

A030473


Primes which are concatenations of 4 consecutive primes.


7



2357, 67717379, 838997101, 139149151157, 149151157163, 383389397401, 503509521523, 557563569571, 577587593599, 587593599601, 601607613617, 613617619631, 727733739743, 937941947953, 1181118711931201
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OFFSET

1,1


LINKS

Zak Seidov and Robert Israel, Table of n, a(n) for n = 1..10000 (n = 1..1205 from Zak Seidov)


MAPLE

P:= select(isprime, [2, seq(p, p=3..10^4, 2)]):
select(isprime, [seq(P[i+3]+10^(1+ilog10(P[i+3]))*P[i+2] + 10^(2+ilog10(P[i+3])+ilog10(P[i+2]))*P[i+1] + 10^(3+ilog10(P[i+3])+ilog10(P[i+2])+ilog10(P[i+1]))*P[i], i=1..nops(P)3)]); # Robert Israel, Apr 14 2016


CROSSREFS

Cf. A030461, A030469, A086040, A086041.
Sequence in context: A156987 A101251 A132904 * A134649 A135377 A081208
Adjacent sequences: A030470 A030471 A030472 * A030474 A030475 A030476


KEYWORD

nonn,base


AUTHOR

Patrick De Geest


EXTENSIONS

Edited by Charles R Greathouse IV, Apr 23 2010


STATUS

approved



