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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 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: A352537 A136611 A004898 * A228127 A327660 A036111 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 May 28 15:12 EDT 2024. Contains 372916 sequences. (Running on oeis4.)