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A220343
The number of decades below 10^n whose semiprime pattern is the same as semiprime pattern in the previous decade.
0
0, 0, 7, 114, 1794, 24605
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OFFSET
1,3
LINKS
Table of n, a(n) for n=1..6.
EXAMPLE
a(3) = 7 because the 7 values less than 10^3 are 104, 389, 435, 438, 529, 658, 884.
CROSSREFS
Cf.
A220063
.
Sequence in context:
A086788
A199672
A240288
*
A183403
A127877
A082487
Adjacent sequences:
A220340
A220341
A220342
*
A220344
A220345
A220346
KEYWORD
nonn
,
base
AUTHOR
Robert G. Wilson v
,
Jonathan Vos Post
, Dec 11 2012
STATUS
approved
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Last modified September 3 15:14 EDT 2024. Contains 375672 sequences. (Running on oeis4.)