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 A278538 a(n) = index of the row where n is located in array A278505. 9
 1, 1, 2, 1, 2, 1, 3, 1, 3, 1, 2, 1, 4, 1, 4, 1, 2, 1, 5, 1, 3, 1, 2, 1, 5, 1, 6, 1, 2, 1, 6, 1, 3, 1, 2, 1, 4, 1, 7, 1, 2, 1, 7, 1, 3, 1, 2, 1, 8, 1, 5, 1, 2, 1, 4, 1, 3, 1, 2, 1, 8, 1, 9, 1, 2, 1, 9, 1, 3, 1, 2, 1, 6, 1, 4, 1, 2, 1, 10, 1, 3, 1, 2, 1, 5, 1, 10, 1, 2, 1, 11, 1, 3, 1, 2, 1, 4, 1, 7, 1, 2, 1, 11, 1, 3, 1, 2, 1, 12, 1, 5, 1, 2, 1, 4, 1, 3, 1, 2, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Ordinal transform of A278539 (most likely, but hinges on that also the columns of A278505 are strictly growing). LINKS Antti Karttunen, Table of n, a(n) for n = 1..10707 FORMULA If A278169(n) = 1, a(n) = A100617(n), otherwise a(n) = A278528(n). If n = A000960(k), a(n) = k, otherwise a(n) = number of the round in which n is removed in the Flavius sieve. PROG (Scheme) (define (A278538 n) (if (not (zero? (A278169 n))) (A100617 n) (A278528 n))) CROSSREFS Cf. A000960, A100617, A278169, A278505, A278507, A278536, A278537, A278539. Sequence in context: A072625 A268187 A232440 * A282903 A332677 A090329 Adjacent sequences:  A278535 A278536 A278537 * A278539 A278540 A278541 KEYWORD nonn AUTHOR Antti Karttunen, Nov 23 2016 STATUS approved

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Last modified June 25 02:23 EDT 2021. Contains 345445 sequences. (Running on oeis4.)