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 A278220 Filtering sequence (related to prime factorization): a(n) = A046523(A241909(n)). 7
 1, 2, 4, 2, 8, 4, 16, 2, 6, 8, 32, 4, 64, 16, 12, 2, 128, 6, 256, 8, 24, 32, 512, 4, 12, 64, 6, 16, 1024, 12, 2048, 2, 48, 128, 36, 6, 4096, 256, 96, 8, 8192, 24, 16384, 32, 12, 512, 32768, 4, 24, 12, 192, 64, 65536, 6, 72, 16, 384, 1024, 131072, 12, 262144, 2048, 24, 2, 144, 48, 524288, 128, 768, 36, 1048576, 6, 2097152, 4096, 30, 256, 72, 96, 4194304, 8, 6, 8192 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Antti Karttunen, Table of n, a(n) for n = 1..410 FORMULA a(n) = A046523(A241909(n)). a(n) = A278219(A075158(n-1)). PROG (Scheme) (define (A278220 n) (A046523 (A241909 n))) CROSSREFS Cf. A046523, A075158, A241909. Cf. also A278219, A278221. Sequence in context: A278531 A095728 A279354 * A174147 A163897 A278541 Adjacent sequences:  A278217 A278218 A278219 * A278221 A278222 A278223 KEYWORD nonn AUTHOR Antti Karttunen, Nov 16 2016 STATUS approved

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Last modified July 29 14:30 EDT 2021. Contains 346346 sequences. (Running on oeis4.)