A336720 A336719 with duplicates removed.

3, 7, 31, 127, 8191, 131071, 524287, 2147483647, 4432676798593, 2305843009213693951, 57912614113275649087721, 618970019642690137449562111, 162259276829213363391578010288127, 170141183460469231731687303715884105727, 79638304766856507377778616296087448490695649

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