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A135025 See Comments lines for definition. +0
2
4, 9, 22, 57, 146, 367, 946, 2507, 6634, 17777, 48522, 133107, 369020, 1028405, 2880288 (list; graph; listen)
OFFSET

1,1

COMMENT

Let P(n) be the n-th prime. Construct the following sequence:

B(1) = 2

If n>= 2, then if (B(n-1) - P(n) < 0) then B(n) = B(n) + P(n) else B(n) = B(n) - P(n)

Definition: if n>=1, the term B(n) is stationary if it satisfies the inequality B(n-1) < B(n) < B(n+1). Sequence gives the indices n of the stationary terms.

EXAMPLE

B(1) = 2

B(2) = 5

B(3) = 0

B(4) = 7

B(5) = 18

B(4) is the first stationary term of B, so 4 is the first term of the sequence.

CROSSREFS

Cf. A135026.

Adjacent sequences: A135022 A135023 A135024 this_sequence A135026 A135027 A135028

Sequence in context: A042833 A048654 A122626 this_sequence A070713 A060250 A138991

KEYWORD

nonn,more

AUTHOR

Lior Deutsch (liorde(AT)gmail.com), Feb 10 2008

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.


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