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 A242350 Multiply a(n-1) by 2 and drop all 0's. 10
 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 124, 248, 496, 992, 1984, 3968, 7936, 15872, 31744, 63488, 126976, 253952, 5794, 11588, 23176, 46352, 9274, 18548, 3796, 7592, 15184, 3368, 6736, 13472, 26944, 53888, 17776, 35552, 7114, 14228, 28456, 56912, 113824 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Sequence enters a loop having period 36 at index 491: a(491) = a(527) = 366784, min and max being 28714 and 11772544. Starting with 3 instead of 1 gives another cycle. - Tom Edgar and Michel Marcus, May 13 2014 Zeroless analog of powers of 2. - N. J. A. Sloane, Jun 11 2014 LINKS Michel Marcus, Table of n, a(n) for n = 1..600 Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1). EXAMPLE Term after 512 is 124 because 512*2=1024, and 1024 becomes 124 if all 0's are taken out. MATHEMATICA NestList[FromDigits[Select[IntegerDigits[2 #], #!=0&]]&, 1, 50] (* Harvey P. Dale, Oct 22 2018 *) PROG (PARI) dropz(n)=d = digits(n); s = 0; for (i=1, #d, if (d[i], s = 10*s + d[i]); ); s; lista(nn) = a = 1; for (i=1, nn, print1(a, ", "); a = dropz(2*a); ) \\ Michel Marcus, May 12 2014 CROSSREFS Cf. A052382, A004719, A243063, A243657, A243658. Sequence in context: A072067 A072049 A281938 * A115213 A009714 A051535 Adjacent sequences: A242347 A242348 A242349 * A242351 A242352 A242353 KEYWORD nonn,base AUTHOR J. Lowell, May 11 2014 EXTENSIONS More terms from Michel Marcus, May 12 2014 STATUS approved

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Last modified July 18 01:34 EDT 2024. Contains 374377 sequences. (Running on oeis4.)