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 A249734 Even bisection of A003961: Replace in 2n each prime factor p(k) with prime p(k+1). 6
 3, 9, 15, 27, 21, 45, 33, 81, 75, 63, 39, 135, 51, 99, 105, 243, 57, 225, 69, 189, 165, 117, 87, 405, 147, 153, 375, 297, 93, 315, 111, 729, 195, 171, 231, 675, 123, 207, 255, 567, 129, 495, 141, 351, 525, 261, 159, 1215, 363, 441, 285, 459, 177, 1125, 273, 891, 345, 279, 183, 945, 201, 333, 825, 2187, 357, 585, 213, 513, 435, 693, 219, 2025, 237, 369 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Antti Karttunen, Table of n, a(n) for n = 1..10000 FORMULA a(n) = A003961(2*n). a(n) = 3 * A003961(n). a(n) = A064989(A249827(n)). a(n) = A003961(A243501(A064216(n))). a(n) = A003961(A243502(A048673(n))). a(n) = A016945(A048673(n)-1). [Permutation of A016945, 6n+3.] Other identities. For all n >= 1: a(A000079(n-1)) = A000244(n). [Maps each 2^n to 3^(n+1).] PROG (Scheme, two alternative definitions) (define (A249734 n) (A003961 (+ n n))) (define (A249734 n) (* 3 (A003961 n))) CROSSREFS Row 2 of A246278. Cf. A249735 (the other bisection of A003961). Cf. A016945, A048673, A064216, A064989, A249827, A243501, A243502. Cf. also A000079, A000244. Sequence in context: A138495 A055927 A316261 * A319316 A087031 A089632 Adjacent sequences:  A249731 A249732 A249733 * A249735 A249736 A249737 KEYWORD nonn AUTHOR Antti Karttunen, Nov 23 2014 STATUS approved

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Last modified August 21 18:38 EDT 2019. Contains 326168 sequences. (Running on oeis4.)