A133026 - OEIS (original) (raw)

A133026

Concatenation of next n Fermat numbers A000215.

1

3, 517, 257655374294967297

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OFFSET

1,1

COMMENTS

a(4) has 292 digits and is too large to include.

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..4

MATHEMATICA

a[n_] := FromDigits[Flatten[IntegerDigits[Table[2^(2^(k - 1)) + 1, {k, n*(n - 1)/2 + 1, n*(n + 1)/2}]]]]; Array[a, 3] (* Amiram Eldar, Jul 09 2025 *)

CROSSREFS

Cf. A000215, A053067, A133013.

Sequence in context: A160362 A155852 A003392 * A100339 A195626 A332153

Adjacent sequences: A133023 A133024 A133025 * A133027 A133028 A133029

KEYWORD

base,easy,nonn

AUTHOR

Omar E. Pol, Nov 09 2007

STATUS

approved