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 A163813 Start with A000961 = prime powers p^k (p prime, k >= 0): 1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 19, 23, 25, ... Then for each m >= 1 swap the m-th prime (k=1) with the m-th proper prime power (k>1). 3
 1, 4, 8, 2, 9, 16, 3, 5, 25, 27, 7, 32, 49, 64, 11, 13, 81, 121, 17, 125, 128, 169, 243, 19, 256, 289, 343, 23, 361, 512, 529, 625, 29, 729, 841, 961, 1024, 1331, 1369, 1681, 1849, 31, 37, 2048, 41, 2187, 2197, 2209, 2401, 2809, 3125, 3481, 3721, 43, 4096, 4489, 4913, 5041, 5329, 6241, 6561, 6859, 6889, 7921, 8192, 9409 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS This is a permutation of A000961. LINKS Diana L. Mecum, Table of n, a(n) for n = 1..142 EXAMPLE First prime, 2, is swapped with first prime power, 4. Second prime, 3, is swapped with 2nd prime power, 8. Third prime, 5, is swapped with 3rd prime power, 9. CROSSREFS Cf. A163814, A000961. Cf. A000040, A008578, A025475. - Omar E. Pol, Aug 14 2009 Cf. A246547. Sequence in context: A133058 A011516 A088609 * A109815 A372297 A339571 Adjacent sequences: A163810 A163811 A163812 * A163814 A163815 A163816 KEYWORD nonn AUTHOR Leroy Quet, Aug 04 2009 EXTENSIONS Edited by N. J. A. Sloane, Aug 10 2009, based on email from Zak Seidov More terms from Diana L. Mecum, Aug 04 2012 STATUS approved

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Last modified August 2 19:53 EDT 2024. Contains 374875 sequences. (Running on oeis4.)