A082797 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A082797

Smallest multiple of n beginning with 7.

7, 70, 72, 72, 70, 72, 7, 72, 72, 70, 77, 72, 78, 70, 75, 704, 714, 72, 76, 700, 714, 704, 713, 72, 75, 78, 702, 700, 725, 720, 713, 704, 726, 714, 70, 72, 74, 76, 78, 720, 738, 714, 731, 704, 720, 736, 705, 720, 735, 700, 714, 728, 742, 702, 715

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(n) is in {n, 2n, 3n, 4n, 5n, 6n, 7n, 8n, 9n, 11n, 12n, 13n, 14n, 15n, 16n, 17n, 18n, 21n, 22n, 23n, 24n, 25n, 26n, 27n, 31n, 32n, 33n, 34n, 35n, 41n, 42n, 43n, 44n, 51n, 52n, 53n, 61n, 62n}. [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 != 7, m += n]; m]; Array[f, 55] (* Robert G. Wilson v *)

PROG

(PARI) a(n)=forstep(k=n, 62*n, n, if(Vec(Str(k))[1]=="7", return(k))) \\ Charles R Greathouse IV, Mar 06 2011

(Haskell)

a082797 n = until ((== 7) . a000030) (+ n) n

-- Reinhard Zumkeller, Mar 27 2012

CROSSREFS

Cf. A082794, A082795, A082796, A082798.

Cf. A000030.