A128303 - OEIS

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A128303

Indices of squares (of semiprimes) in the 4-almost primes.

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; internal format)

	OFFSET	`1,2`
	COMMENTS	`A014613(a(n)) = A074985(n) = A001358(n)^2.`
	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: A169923 A158022 A007434 * A123906 A065970 A024463` `Adjacent sequences: A128300 A128301 A128302 * A128304 A128305 A128306`
	KEYWORD	`nonn`
	AUTHOR	`Rick L. Shepherd (rshepherd2(AT)hotmail.com), Mar 04 2007`

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Last modified February 15 09:54 EST 2012. Contains 205763 sequences.