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A062920 Numbers k that, when expressed in base 4 and then interpreted in base 5, give a multiple of k. 11
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
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
Sequence in context: A352537 A136611 A004898 * A228127 A327660 A036111
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 May 28 15:12 EDT 2024. Contains 372916 sequences. (Running on oeis4.)