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A247069
a(n) = number of distinct primes obtained when inserting 1 anywhere in A069246(n).
1
2, 2, 2, 2, 3, 3, 2, 2, 3, 4, 3, 3, 3, 2, 2, 3, 4, 4, 2, 3, 4, 3, 3, 4, 3, 5, 5, 5, 5, 4, 4, 4, 6, 4, 5, 5, 5, 6, 5, 4, 6, 6, 5, 4, 5, 6, 7, 6, 5, 5, 4, 5, 5, 6, 3, 5, 6, 5, 6, 5, 6, 3, 6, 7, 5, 5, 4, 5, 5, 5, 6, 4, 7, 4, 4, 6, 6, 4, 5, 7, 3, 3, 3, 4, 3, 5, 2, 3, 5, 5, 6, 7, 6, 4, 7, 5, 6, 5, 7, 3, 8
OFFSET
1,1
COMMENTS
Among the first 145 terms the largest is a(140)=9 because inserting 1 in 12 places into A069246(140)=18064911343, we get only 9 distinct primes (in the order of their appearances): 118064911343, 181064911343, 180164911343, 180614911343, 180641911343, 180649111343, 180649113143, 180649113413, 180649113431.
EXAMPLE
a(7)=2 because inserting 1 in 4 possible places into A069246(7)=151 we get only 2 distinct primes, 1151 and 1511.
CROSSREFS
Cf. A069246.
Sequence in context: A196046 A152724 A081743 * A367008 A366800 A366799
KEYWORD
nonn,base
AUTHOR
Zak Seidov, Nov 17 2014
STATUS
approved