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A062920 Numbers k that, when expressed in base 4 and then interpreted in base 5, give a multiple of k. 0
0, 1, 2, 3, 1060, 2137, 3197, 3214, 3217, 3337, 313259, 313406, 730473, 2304689, 2416087, 3579260, 28850251, 31289731, 132716102, 206771980, 530864408, 616417140, 621776006, 1553684761, 2123457632, 2232402380, 5264756497, 8929609520, 22137774186, 2543308829640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

3 in base 4 is 3, which interpreted in base 5 is 3 = 1*3.

MATHEMATICA

Join[{0}, Select[Range[5000000], Divisible[FromDigits[IntegerDigits[#, 4], 5], #]&]] (* Harvey P. Dale, Dec 10 2012 *)

PROG

(PARI) baseE(x, b)= { local(d, e, f); e=0; f=1; while (x>0, d=x-b*(x\b); x\=b; e+=d*f; f=f*10); return(e) } baseI(x, b)= { local(d, e, f); e=0; f=1; while (x>0, d=x-10*(x\10); x\=10; e+=d*f; f=f*b); return(e) } { n=-1; for (m=0, 10^9, x=baseI(baseE(m, 4), 5); if (x%m == 0, write("b062920.txt", n++, " ", m); if (n==15, break)) ) } \\ Harry J. Smith, Aug 13 2009

CROSSREFS

Cf. A062921, A062922, A062923, A032540.

Sequence in context: A076155 A136611 A004898 * A228127 A036111 A097549

Adjacent sequences:  A062917 A062918 A062919 * A062921 A062922 A062923

KEYWORD

base,nonn

AUTHOR

Erich Friedman, Jul 21 2001

EXTENSIONS

More terms from Naohiro Nomoto, Aug 06 2001

Offset corrected by and a(17)-a(30) from Giovanni Resta, Jun 28 2018

STATUS

approved

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)