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A161372 4n^2-10n+107. 0
107, 101, 121, 103, 143, 113, 173, 131, 211 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

NE to SW Diagonal of Ulam Spiral, with 101 at center

The sequence does not match the definition. A working definition might be a(2n)=4n^2-10n+107, a(2n-1)=4n^2+2n+101, a(n)=n^2-n+105+2*(-1)^n*(1-2*n), but this seems to be unrelated to Ulam spirals. [From R. J. Mathar, Jun 11 2009]

LINKS

Table of n, a(n) for n=1..9.

CROSSREFS

Sequence in context: A178546 A096712 A161176 * A099652 A294744 A118774

Adjacent sequences:  A161369 A161370 A161371 * A161373 A161374 A161375

KEYWORD

nonn

AUTHOR

Milton L. Brown (miltbrown(AT)earthlink.net), Jun 08 2009

STATUS

approved

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Last modified September 19 14:36 EDT 2020. Contains 337178 sequences. (Running on oeis4.)