A128304 Indices of 4th powers (of primes) in the 4-almost primes.

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

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: A045732 A371208 A077192 * A247728 A056784 A166769

Adjacent sequences: A128301 A128302 A128303 * A128305 A128306 A128307

Keyword

nonn

Author

Rick L. Shepherd, Mar 05 2007

Status

approved