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A075308 Number of n-digit perfect powers. 10
4, 8, 28, 84, 242, 744, 2284, 7096, 22179, 69561, 218759, 689206, 2173942, 6862783, 21676671, 68493153, 216477260, 684309327, 2163434093, 6840212693, 21628140126, 68388775913, 216252650605, 683825838922 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Starting with n=2, a(n)=A070428(n) - A070428 (n-1). E.g. a(3)=28 = A070428(3) - A070428 (2). = 41-13 ( in A070428 offset is 0).

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

a(2)=8 because there are 8 2-digit pp's: 16, 25, 27, 32, 36, 49, 64, 81.

CROSSREFS

Cf. A001597, A070428.

Sequence in context: A280118 A143555 A025234 * A280085 A256456 A270522

Adjacent sequences:  A075305 A075306 A075307 * A075309 A075310 A075311

KEYWORD

easy,nonn,base

AUTHOR

Zak Seidov, Oct 11 2002

STATUS

approved

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Last modified March 27 13:47 EDT 2017. Contains 284176 sequences.