A097421 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A097421

a(n) = (5^(2^n) - 1)/2^(n+2).

1, 3, 39, 12207, 2384185791, 181898940354585647583, 2117582368135750847670806251699104905128479, 573971850987445072250359637315549647372395291392620860111695169081258427468128502368927

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Cf. A070632.

Sequence in context: A076628 A198411 A367033 * A180418 A166999 A319955

Adjacent sequences: A097418 A097419 A097420 * A097422 A097423 A097424

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Aug 21 2004

STATUS

approved