A336720 - OEIS

A336720

A336719 with duplicates removed.

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