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A178760
Number of tests performed to find the n-th term of the EKG sequence A064413.
2
0, 0, 2, 3, 1, 4, 6, 3, 3, 1, 5, 7, 4, 1, 7, 9, 3, 5, 5, 1, 13, 7, 9, 5, 11, 6, 5, 1, 11, 8, 6, 6, 1, 18, 9, 6, 1, 20, 9, 5, 7, 7, 1, 26, 7, 8, 8, 9, 10, 7, 14, 11, 8, 13, 16, 8, 1, 30, 11, 9, 1, 32, 12, 8, 9, 11, 1, 44, 10, 12, 10, 12, 13, 1, 49, 11, 12, 9, 13, 12, 1, 48, 12, 10, 14, 18, 12
OFFSET
1,3
COMMENTS
In the EKG sequence, to find the n-th term, we test each larger number not already in the sequence, looking for one that has a factor in common with previous term. The first two terms are zero because the first two terms of the EKG sequence are given. The odd primes appear in the EKG sequence where a(n) = 1. See A178761 for the cumulative number of tests.
CROSSREFS
Sequence in context: A330139 A349358 A046671 * A235715 A129566 A073809
KEYWORD
nonn
AUTHOR
T. D. Noe, Jun 10 2010
STATUS
approved