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 A020332 Numbers whose base-4 representation is the juxtaposition of two identical strings. 7
 5, 10, 15, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255, 1040, 1105, 1170, 1235, 1300, 1365, 1430, 1495, 1560, 1625, 1690, 1755, 1820, 1885, 1950, 2015, 2080, 2145, 2210, 2275, 2340, 2405, 2470, 2535, 2600, 2665, 2730, 2795, 2860, 2925, 2990 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Amiram Eldar, Table of n, a(n) for n = 1..10000 FORMULA a(n) = n*4^floor(log_4(n)+1) + n. - Ilya Gutkovskiy, Jan 26 2018 EXAMPLE 102_10 = 1212_4. - Jon E. Schoenfield, Feb 11 2021 MATHEMATICA a[n_] := n + n*4^Floor[Log[4, n] + 1]; Array[a, 50] (* Amiram Eldar, Apr 06 2021 *) CROSSREFS Cf. A020330, A020331, A020333, A020334, A020335, A020336, A020337, A020338. Sequence in context: A067237 A196157 A048703 * A244025 A044830 A033002 Adjacent sequences:  A020329 A020330 A020331 * A020333 A020334 A020335 KEYWORD nonn,base AUTHOR David W. Wilson, Melia Aldridge (ma38(AT)spruce.evansville.edu) STATUS approved

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Last modified September 28 10:48 EDT 2021. Contains 347714 sequences. (Running on oeis4.)