login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217591 Absolute differences between emirps (A006567) and their reversals. 0
18, 54, 18, 36, 54, 72, 36, 18, 594, 198, 342, 594, 594, 792, 792, 198, 396, 396, 594, 594, 594, 198, 396, 198, 396, 594, 594, 198, 198, 198, 792, 594, 198, 792, 594, 792, 7992, 180, 270, 2268, 540, 8532, 810, 6804, 1908, 7902, 360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This is unsorted, and in order of appearance of emirps.

All values are multiples of 18 (A008600). - Charles R Greathouse IV, Oct 15 2012

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = | A006567(n) - R(A006567(n)) | = | A006567(n) - A004086(A006567(n)) |.

EXAMPLE

a(1) = absolute value of first emirp versus its reversal = |13 - 31| = |-18| = 18.

a(2) = |17 - 71| = |-54| = 54.

a(3) = |31 - 13| = |18| = 18.

a(4) = |37 - 73| = |-36| = 36.

CROSSREFS

Cf. A004086, A006567, A217286, A217386, A217387.

Sequence in context: A133356 A052495 A052902 * A059137 A096011 A176026

Adjacent sequences:  A217588 A217589 A217590 * A217592 A217593 A217594

KEYWORD

nonn,base,easy

AUTHOR

Jonathan Vos Post, Oct 07 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 5 03:31 EST 2020. Contains 338943 sequences. (Running on oeis4.)