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A027438 Largest prime factor of [e*2^n]. 0
2, 5, 5, 7, 43, 43, 173, 347, 139, 107, 23, 293, 293, 293, 293, 293, 79, 79, 883, 883, 114013, 114013, 114013, 114013, 1232573, 1232573, 1499, 364841611, 364841611, 364841611, 364841611, 170801, 170801, 56812319, 56812319, 56812319, 56812319 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..36.

MATHEMATICA

Table[FactorInteger[Floor[E 2^n]][[-1, 1]], {n, 0, 40}] (* Harvey P. Dale, May 31 2013 *)

PROG

(PARI) for(n=0, 22, print(factor(floor(exp(1)*2^n))))

CROSSREFS

Cf. A027437.

Sequence in context: A165898 A194531 A092394 * A204237 A153162 A168199

Adjacent sequences:  A027435 A027436 A027437 * A027439 A027440 A027441

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Allan C. Wechsler

EXTENSIONS

More terms from Jason Earls, Jul 11 2001

STATUS

approved

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Last modified August 20 10:05 EDT 2019. Contains 326149 sequences. (Running on oeis4.)