A132396 a(n)=(2^(2^n) + 3^(2^n) + 5^(2^n))/19

2, 38, 20918, 8033210678, 1225424537811128774198, 28531636118039771088818247968115767751133238, 15467030931872204052220217595650084422758156440239110185314071903881367885819214004747318

Offset

1,1

Comments

The next term (a(8)) has 178 digits. - Harvey P. Dale, Jun 03 2020

Links

Table of n, a(n) for n=1..7.

Mathematica

f[n_] := Module[{c = 2^n}, (2^c + 3^c + 5^c)/19]; Array[f, 7] (* Harvey P. Dale, Jun 03 2020 *)

Prog

(PARI) a(n)=(2^(2^n) + 3^(2^n) + 5^(2^n))/19

Crossrefs

Sequence in context: A184994 A334554 A348162 * A263374 A066244 A055689

Adjacent sequences: A132393 A132394 A132395 * A132397 A132398 A132399

Keyword

nonn

Author

Alexander R. Povolotsky, Nov 11 2007

Status

approved