OEIS Logo

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This page contains comments and suggestions related to the OEIS Logos, on either the Main OEIS or OEIS Wiki.

OEIS Logo in Main OEIS

The current OEIS Logo in the Main OEIS originates from the former AT&T site of the OEIS.

Editor's Note: "current" means "pre-2012" (time of writing).-- "Logo" actually means "banner" here. — MFH, Aug. 6, 2016

Suggestions for OEIS Logo in Main OEIS

Some proposed suggestions for OEIS Logo are

• File:Logo suggestion mtqdtmnxt.jpg (graph)
• File:Logo suggestion 6vflibl5x.jpg (graph with labels)
• http://www.luschny.de/temp/OEISportal.html (triangular numbers as small dots triangles)
• http://www.luschny.de/temp/OEISPage.htm (triangular numbers as large dots triangles)
• Robert Munafo, OEIS page header image, posting to SeqFan on Jun 25 2012 (minimalist representation of Fibonacci numbers)

OEIS Logo in OEIS Wiki

In the OEIS Logo (appearing in top left corner of OEIS Wiki pages), the O atop the I together appear to suggest a magnifying glass!

Sequences matching the 14 terms shown on the OEIS Logo

Currently (June 3, 2012), the 14 integer sequence terms shown on the OEIS Logo match the following three sequences (the first two with offset 0, the last one with offset 1); actually, the first 23 terms of the three sequences are identical!

A005132 Recaman's sequence: a(0) = 0; for n > 0, a(n) = a(n-1)-n if that number is positive and not already in the sequence, otherwise a(n) = a(n-1)+n.

{0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 42, 17, 43, 16, 44, 15, 45, 14, 46, 79, 113, 78, 114, 77, 39, 78, 38, 79, 37, 80, ...}

A118201 Smallest difference such that both difference and number do not occur previously, n >= 0.

{0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 18, 44, 68, 93, 66, 38, 67, 37, 5, 36, 69, 35, 70, 34, 71, 33, 72, 32, 73, 31, 74, 30, ...}

A171884 Lexicographically first injective and unbounded sequence a(n) satisfying |a(n+1)-a(n)| = n for all n, n >= 1.

{0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, 42, 63, 41, 64, 40, 65, 39, 66, 38, 67, 37, 68, 36, 69, 35, 70, 34, 71, 33, 72, 32, 73, 31, 74, 30, ...}