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A162954
a(n) = the smallest positive integer not yet occurring in the sequence such that both a(n) and the number of divisors of a(n) contain the same number of 1's in their binary representations as n has when written in binary.
1
1, 2, 9, 8, 12, 18, 448, 128, 20, 36, 704, 48, 832, 1216, 720, 32768, 68, 72, 1296, 80, 1344, 1600, 900, 96, 2240, 2368, 1200, 2624, 1584, 2352, 414720, 2147483648, 132, 160, 3136, 260, 4288, 4416, 2448, 272, 4672, 5184, 2704, 6208, 3600, 4400, 640000
OFFSET
1,2
COMMENTS
Rearrangement of A162952. [From Max Alekseyev, Apr 29 2010]
FORMULA
a(2^n) = 2^(2^n - 1) [From Max Alekseyev, Apr 29 2010]
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Leroy Quet, Jul 18 2009
EXTENSIONS
More terms from Max Alekseyev, Apr 29 2010
STATUS
approved