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A243803
Number of numbers k in interval [(p_n)^2+1, (p_n)^4] for which lpf(k-3)>lpf(k-1)>=p_n, where p_n=prime(n) and lpf = A020639.
4
40, 85, 393, 625, 1557, 2106, 4069, 9558, 11476, 22060, 31530, 35998, 49142, 76678, 113799, 125010, 176824, 216378, 234064, 313511, 372054, 481764, 668344, 768307, 811635, 926452, 975785, 1105924, 1751993, 1949976, 2299392, 2394921, 3130534, 3250605, 3751262, 4306910, 4683674, 5332960
OFFSET
3,1
COMMENTS
a(n) and A243804(n) approximate each other with a small relative error.
Positions n for which a(n) < A243804(n) are 11, 13, 14, 17, 18, 19, 20 (...).
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved