A390114 - OEIS

A390114

a(n) is the index where n appears for first time in the list of first differences of the numbers with middle divisors.

1, 2, 6, 11, 32, 58, 153, 189, 227, 439, 837, 915, 1949, 2067, 2485, 2615, 2938, 7143, 8016, 7668, 23497, 30273, 43179, 42134, 35240, 32812, 115743, 47162, 298915, 48948, 590375, 410001, 153313, 328612, 1024469, 1360274, 625810, 638018, 588530, 1258690, 470528

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OFFSET

1,2

COMMENTS

The middle divisors of n are the divisors in the half-open interval [sqrt(n/2), sqrt(n*2)).

a(n) is the index where n appears for first time in A280919.

LINKS

Table of n, a(n) for n=1..41.

FORMULA

A280295(n) = A071562(a(n)).

CROSSREFS

Cf. A067742, A071562, A237593, A245092, A276112, A277437, A280223, A280295, A280919, A281012.