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A284662
Number of harmonic seed numbers (A035527) whose largest prime factor is the n-th odd prime (A065091).
0
1, 1, 3, 0, 5, 2, 19, 0, 0, 37, 10, 19, 21, 0, 0, 0, 89, 143, 84, 97, 26, 0, 127, 283
OFFSET
1,3
LINKS
Yusuke Chishiki, Takeshi Goto, and Yasuo Ohno, On the largest prime divisor of an odd harmonic number, Mathematics of Computation, Vol. 76, No. 259 (2007), pp. 1577-1587.
EXAMPLE
There are 3 harmonic seed numbers whose largest prime factor is A065091(3) = 7 (28, 672 and 30240), thus a(3) = 3.
CROSSREFS
Cf. A035527.
Sequence in context: A177886 A011293 A181884 * A292031 A201565 A088191
KEYWORD
nonn,more
AUTHOR
Amiram Eldar, Mar 31 2017
STATUS
approved