login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A065580 Smallest prime ending in exactly n 3's. 7
3, 233, 2333, 23333, 733333, 10333333, 83333333, 1033333333, 17333333333, 23333333333, 2633333333333, 10333333333333, 53333333333333, 3233333333333333, 1333333333333333, 23333333333333333 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n=1,...,100

MATHEMATICA

Do[a = Table[3, {n} ]; k = 0; While[ b = FromDigits[ Join[ IntegerDigits[k], a]]; Mod[k, 10] == 3 || !PrimeQ[b], k++ ]; Print[b], {n, 1, 17} ]

PROG

(PARI) { for (n=1, 100, t=10^n; b=(t - 1) / 3; d=0; while(!isprime(b + t*d), d++; if (d%10==3, d++)); write("b065580.txt", n, " ", b + t*d) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 23 2009]

CROSSREFS

Cf. A037059, A065586, A065821, A065581, A065582.

Sequence in context: A100201 A159807 A037059 * A072320 A162603 A053970

Adjacent sequences:  A065577 A065578 A065579 * A065581 A065582 A065583

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 28 2001

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 05:41 EST 2012. Contains 205570 sequences.