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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
OFFSET
1,3
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
KEYWORD
nonn,base
AUTHOR
STATUS
approved