The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A199348 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A199348

Primes having only the (decimal) digits 3, 4 and 8.
(history; published version)

#8 by Harvey P. Dale at Sat Apr 09 16:52:35 EDT 2022

STATUS

editing

approved

#7 by Harvey P. Dale at Sat Apr 09 16:52:32 EDT 2022

LINKS

Harvey P. Dale, <a href="/A199348/b199348.txt">Table of n, a(n) for n = 1..1000</a>

STATUS

approved

editing

#6 by Harvey P. Dale at Sat Apr 09 16:51:21 EDT 2022

STATUS

editing

approved

#5 by Harvey P. Dale at Sat Apr 09 16:51:16 EDT 2022

MATHEMATICA

Table[Select[FromDigits/@Tuples[{3, 4, 8}, n], PrimeQ], {n, 6}]//Flatten (* Harvey P. Dale, Apr 09 2022 *)

STATUS

approved

editing

#4 by Russ Cox at Sat Mar 31 13:48:35 EDT 2012

AUTHOR

_M. F. Hasler (oeis2011-removeThis(AT)hasler.fr), _, Nov 05 2011

Discussion

Sat Mar 31

13:48

OEIS Server: https://oeis.org/edit/global/895

#3 by M. F. Hasler at Mon Nov 07 08:16:27 EST 2011

STATUS

editing

approved

#2 by M. F. Hasler at Sat Nov 05 13:15:20 EDT 2011

NAME

allocated for M. F. Hasler

Primes having only the (decimal) digits 3, 4 and 8.

DATA

3, 43, 83, 383, 433, 443, 883, 3343, 3433, 3833, 4483, 8443, 33343, 34483, 34843, 34883, 38333, 38833, 44383, 44483, 44843, 48383, 48883, 83383, 83443, 83833, 83843, 84443, 88843, 88883, 333383, 333433, 334333, 334843, 338383, 343333, 343433, 344483, 344843, 348433, 348443, 348833, 348883, 383483, 383833, 384343, 384383, 388483

OFFSET

1,1

COMMENTS

All terms end in 3 and those > 3 never have the same number of 4's and 8's.

PROG

(PARI) a(n, list=0, L=[3, 4, 8], reqpal=0)={my(t); for(d=1, 1e9, u=vector(d, i, 10^(d-i))~; forvec(v=vector(d, i, [1+(i==1&!L[1]), #L]), isprime(t=vector(d, i, L[v[i]])*u) || next; reqpal & !isprime(A004086(t)) & next; list & print1(t", "); n--|return(t)))}

CROSSREFS

Cf. A020449 - A020472, A199325 - A199329.

KEYWORD

allocated

nonn,base,changed

AUTHOR

M. F. Hasler (oeis2011-removeThis(AT)hasler.fr), Nov 05 2011

STATUS

approved

editing

#1 by M. F. Hasler at Sat Nov 05 12:33:22 EDT 2011

NAME

allocated for M. F. Hasler

KEYWORD

allocated

STATUS

approved