A082792 -id:A082792 - cp's OEIS frontend

A187285 Smallest multiple of n beginning with 1.

1, 10, 12, 12, 10, 12, 14, 16, 18, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 100, 105, 110, 115, 120, 100, 104, 108, 112, 116, 120, 124, 128, 132, 102, 105, 108, 111, 114, 117, 120, 123, 126, 129, 132, 135, 138, 141, 144, 147, 100, 102, 104, 106, 108, 110

Offset: 1

Robert G. Wilson v, Mar 07 2011

a(n) is in {n, 2n, 3n, 4n, 5n}. [Charles R Greathouse IV, Mar 07 2011]

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

Cf. A082811, A082792, A082794, A082795, A082796, A082797, A082798, A187090.

Cf. A000030.

a187285 n = until ((== 1) . a000030) (+ n) n
-- Reinhard Zumkeller, Mar 27 2012

f[n_] := Block[{m = n}, While[ First@ IntegerDigits@ m != 1, m += n]; m]; Array[f, 55]

a(n)=forstep(k=n, 5*n, n, if(Vec(Str(k))[1]=="1", return(k))) \\ Charles R Greathouse IV, Mar 07 2011

A187090 Smallest multiple of n beginning with 9.

Original entry on oeis.org

9, 90, 9, 92, 90, 90, 91, 96, 9, 90, 99, 96, 91, 98, 90, 96, 901, 90, 95, 900, 903, 902, 92, 96, 900, 910, 918, 924, 928, 90, 93, 96, 99, 918, 910, 900, 925, 912, 936, 920, 902, 924, 903, 924, 90, 92, 94, 96, 98, 900, 918, 936, 901, 918, 935

Offset: 1

Robert G. Wilson v, Mar 06 2011

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, 36n, 41n, 42n, 43n, 44n, 45n, 51n, 52n, 53n, 54n, 61n, 62n, 63n, 71n, 72n, 81n}. [Charles R Greathouse IV, Mar 06 2011]

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

Cf. A082811, A082792, A082794, A082795, A082796, A082797, A082798.

Cf. A000030.

a187090 n = until ((== 9) . a000030) (+ n) n
-- Reinhard Zumkeller, Mar 27 2012

f[n_] := Block[{m = n}, While[ First@ IntegerDigits@ m != 9, m += n]; m]; Array[f, 55]

a(n)=forstep(k=n, 81*n, n, if(Vec(Str(k))[1]=="9", return(k))) \\ Charles R Greathouse IV, Mar 06 2011

A295430 a(n) is the least nontrivial multiple of n that begins with 3.

Original entry on oeis.org

3, 30, 30, 32, 30, 30, 35, 32, 36, 30, 33, 36, 39, 308, 30, 32, 34, 36, 38, 300, 315, 308, 322, 312, 300, 312, 324, 308, 319, 300, 310, 320, 330, 306, 315, 324, 333, 304, 312, 320, 328, 336, 301, 308, 315, 322, 329, 336, 343, 300, 306, 312, 318, 324, 330, 336, 342, 348, 354, 300, 305, 310, 315

Offset: 1

Robert Israel, Feb 12 2018

nonn

Robert Israel, Table of n, a(n) for n = 1..10000

Cf. A082792.

f:= proc(n) local m,k;
  for m from 0 do
    k := max(2, ceil(3*10^m/n));
    if k*n < 4*10^m then return k*n end if
  end do
end proc:
seq(f(i),i=1..100);

a(n) = {my(k=2); while(digits(k*n)[1] != 3, k++); k*n;} \\ Michel Marcus, Feb 13 2018

def A295430(n):
    m = 2*n
    while True:
        if str(m)[0] == '3':
            return m
        m += n # Chai Wah Wu, Feb 13 2018

cp's OEIS Frontend

A187285 Smallest multiple of n beginning with 1.

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A187090 Smallest multiple of n beginning with 9.

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A295430 a(n) is the least nontrivial multiple of n that begins with 3.

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