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A248637 Numbers k such that A248636(k+1) = A248636(k) + 1. 3
2, 4, 7, 8, 10, 12, 14, 15, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40, 41, 43, 44, 46, 47, 48, 50, 51, 53, 54, 56, 57, 59, 60, 61, 63, 64, 66, 67, 69, 70, 71, 73, 74, 76, 77, 78, 80, 81, 83, 84, 86, 87, 88, 90, 91, 93, 94, 95, 97, 98 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

EXAMPLE

(A248636(k+1) = A248636(k)) = (2, 1, 2, 1, 2, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2,... ), so that A248637 = (2, 4, 7, 8, 10, 12, 14, ... ) and A248638 = (1, 3, 5, 6, 9, 11, 13, ...).

MATHEMATICA

z = 300; p[k_] := p[k] = Sum[(h^3/3^h), {h, 1, k}];

d = N[Table[33/8 - p[k], {k, 1, z/5}], 12]

f[n_] := f[n] = Select[Range[z], 33/8 - p[#] < 1/4^n &, 1];

u = Flatten[Table[f[n], {n, 1, z}]]  (* A248636 *)

d = Differences[u]

v = Flatten[Position[d, 1]] (* A248637 *)

w = Flatten[Position[d, 2]] (* A248638 *)

CROSSREFS

Cf. A248635, A248636, A248630.

Sequence in context: A175282 A127875 A056231 * A131346 A341350 A047540

Adjacent sequences:  A248634 A248635 A248636 * A248638 A248639 A248640

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Oct 11 2014

STATUS

approved

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Last modified May 15 08:06 EDT 2021. Contains 343909 sequences. (Running on oeis4.)