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A336720 A336719 with duplicates removed. 2
3, 7, 31, 127, 8191, 131071, 524287, 2147483647, 4432676798593, 2305843009213693951, 57912614113275649087721, 618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727, 79638304766856507377778616296087448490695649 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also, record values in A005420.

Mersenne primes (A000668) are a subsequence.

For the corresponding orders of 2 (exponents), see A336721.

LINKS

Table of n, a(n) for n=1..15.

PROG

(PARI) re=0; for(k=2, +oo, p=vecmax(factor(2^k-1)[, 1]); if(p>re, re=p; print1(re, ", ")))

CROSSREFS

Cf. A000668, A005420, A336719, A336721.

Sequence in context: A081093 A057612 A136005 * A183077 A088552 A000668

Adjacent sequences:  A336717 A336718 A336719 * A336721 A336722 A336723

KEYWORD

nonn

AUTHOR

Jeppe Stig Nielsen, Aug 01 2020

STATUS

approved

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Last modified March 4 14:23 EST 2021. Contains 341794 sequences. (Running on oeis4.)