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A247780 Numbers k such that A247778(k+1) - A247778(k) = 2. 3
2, 5, 8, 10, 13, 16, 19, 22, 24, 27, 30, 33, 35, 38, 41, 44, 47, 49, 52, 55, 58, 61, 63, 66, 69, 72, 74, 77, 80, 83, 86, 88, 91, 94, 97, 100, 102, 105, 108, 111, 113, 116, 119, 122, 125, 127, 130, 133, 136, 138, 141, 144, 147, 150, 152, 155, 158, 161, 164 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A247779.

LINKS

Clark Kimberling, Table of n, a(n) for n = 1..1000

EXAMPLE

The values of e - (1 + 1/k)^k for k = 1..8 are approximately 0.718282, 0.468282, 0.347911, 0.276876, 0.229962, 0.196655, 0.171782, 0.152497, so that the first 6 terms of A247778 are 1,2,4,5,6,8, and the first three terms of A247780 are 1,3,4.

MATHEMATICA

z = 600; f[n_] := f[n] = Select[Range[z], E - (1 + 1/#)^# < 1/n &, 1];

u = Flatten[Table[f[n], {n, 1, z}]]       (*A247778*)

d1 = Flatten[Position[Differences[u], 1]] (*A247779*)

d2 = Flatten[Position[Differences[u], 2]] (*A247780*)

CROSSREFS

Cf. A247778, A247779.

Sequence in context: A186540 A059556 A248520 * A189365 A024509 A084889

Adjacent sequences:  A247777 A247778 A247779 * A247781 A247782 A247783

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Sep 23 2014

STATUS

approved

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Last modified April 17 19:37 EDT 2021. Contains 343070 sequences. (Running on oeis4.)