login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A082811 Smallest multiple of n beginning with 2. 4
2, 2, 21, 20, 20, 24, 21, 24, 27, 20, 22, 24, 26, 28, 210, 208, 204, 216, 209, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 210, 217, 224, 231, 204, 210, 216, 222, 228, 234, 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 200, 204, 208, 212, 216, 220 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) is in {n, 2n, 3n, 4n, 5n, 6n, 7n, 11n, 12n, 13n, 14n}. [Charles R Greathouse IV, Mar 06 2011]

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

MATHEMATICA

f[n_] := Block[{m = n}, While[ First@ IntegerDigits@ m != 2, m += n]; m]; Array[f, 55] (* Robert G. Wilson v *)

PROG

(PARI) a(n)=forstep(k=n, 14*n, n, if(Vec(Str(k))[1]=="2", return(k))) \\ Charles R Greathouse IV, Mar 06 2011

(Sage) def A082811(n): return next(k for k in PositiveIntegers() if (n*k).digits()[-1] == 2) # [D. S. McNeil, Mar 07 2011]

(Haskell)

a082811 n = until ((== 2) . a000030) (+ n) n

-- Reinhard Zumkeller, Mar 27 2012

CROSSREFS

Cf. A082784, A054850, A082786, A082787, A082788, A082789, A082791.

Cf. A000030.

Sequence in context: A184717 A134046 A081687 * A014353 A153438 A190632

Adjacent sequences:  A082808 A082809 A082810 * A082812 A082813 A082814

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Apr 19 2003

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 3 03:03 EST 2021. Contains 341756 sequences. (Running on oeis4.)