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A210700 A047160(3n): smallest m >= 0 with both 3n - m and 3n + m prime. 3
0, 1, 2, 1, 2, 1, 2, 5, 4, 1, 4, 5, 2, 1, 2, 5, 8, 7, 4, 1, 4, 5, 2, 1, 4, 5, 2, 5, 14, 7, 4, 7, 2, 1, 2, 1, 2, 13, 10, 7, 14, 13, 2, 5, 4, 1, 10, 5, 10, 1, 4, 7, 8, 5, 2, 5, 8, 7, 4, 1, 10, 5, 8, 1, 2, 1, 10, 7, 16, 13, 14, 17, 8, 11, 2, 1, 2, 5, 4, 1, 14, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

This sequence is interesting because, apart from a(2)=1, A155764 appears to consist only of multiples of three. Equivalently, since n and A047160(n) are coprime (for nonzero A047160(n)), no multiple of three appears to occur in A155765.

LINKS

Jason Kimberley, Table of n, a(n) for n = 1..3333

OEIS (Plot 2), Plot of (log(n), log(a(n)))

OEIS (Plot 2), Plot of (log(A210701(n)), log(A210702(n)))

CROSSREFS

Cf. A210701 (location of records in this sequence), A210702 (records in this sequence).

Sequence in context: A332510 A001314 A020733 * A215745 A059913 A329602

Adjacent sequences:  A210697 A210698 A210699 * A210701 A210702 A210703

KEYWORD

nonn,easy

AUTHOR

Jason Kimberley, Oct 15 2012

STATUS

approved

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Last modified August 3 07:58 EDT 2021. Contains 346435 sequences. (Running on oeis4.)