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A128304 Indices of 4th powers (of primes) in the 4-almost primes. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A014613(a(n)) = A030514(n) = A000040(n)^4.

LINKS

Zak Seidov, Table of n, a(n) for n = 1..40

EXAMPLE

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.

CROSSREFS

Cf. A128303, A014613, A030514, A000040, A128305.

Sequence in context: A105718 A045732 A077192 * A247728 A056784 A166769

Adjacent sequences:  A128301 A128302 A128303 * A128305 A128306 A128307

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, Mar 05 2007

STATUS

approved

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Last modified June 26 16:55 EDT 2022. Contains 354885 sequences. (Running on oeis4.)