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 A128303 Indices of squares (of semiprimes) in the 4-almost primes. 2
 1, 3, 8, 12, 24, 29, 59, 66, 90, 97, 162, 172, 187, 224, 234, 335, 385, 412, 489, 531, 551, 630, 692, 791, 921, 997, 1128, 1223, 1256, 1285, 1420, 1484, 1518, 1549, 1937, 2146, 2315, 2441, 2483, 2556, 2606, 2651, 2915, 3124, 3175, 3542, 3587, 3645, 3751, 3800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A014613(a(n)) = A074985(n) = A001358(n)^2. LINKS Table of n, a(n) for n=1..50. EXAMPLE a(5) = 24 as 196=14^2=semiprime(5)^2, the 5th square in the 4-almost primes, is the 24th 4-almost prime. CROSSREFS Cf. A128302, A014613, A074985, A001358, A128304. Sequence in context: A158022 A209934 A007434 * A123906 A065970 A326890 Adjacent sequences: A128300 A128301 A128302 * A128304 A128305 A128306 KEYWORD nonn AUTHOR Rick L. Shepherd, Mar 04 2007 STATUS approved

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Last modified September 22 11:59 EDT 2023. Contains 365531 sequences. (Running on oeis4.)