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A128304
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Indices of 4th powers (of primes) in the 4-almost primes.
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2
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1, 8, 90, 385, 2556, 5138, 15590, 24646, 53993, 139199, 182476, 375363, 569617, 691012, 991150, 1613115, 2490040, 2849478, 4163793, 5263838, 5888203, 8100907, 9886861, 13102875, 18538021, 21816421, 23608907, 27525519, 29659283, 34290671
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OFFSET
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1,2
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COMMENTS
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A014613(a(n)) = A030514(n) = A000040(n)^4.
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LINKS
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Zak Seidov, Table of n, a(n) for n = 1..40
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EXAMPLE
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a(3) = 90 as 625=5^4=prime(3)^4, the third 4th power in the 4-almost primes, is the 90th 4-almost prime.
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CROSSREFS
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Cf. A128303, A014613, A030514, A000040, A128305.
Sequence in context: A105718 A045732 A077192 * A247728 A056784 A166769
Adjacent sequences: A128301 A128302 A128303 * A128305 A128306 A128307
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KEYWORD
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nonn
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AUTHOR
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Rick L. Shepherd, Mar 05 2007
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STATUS
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approved
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