A109405 - OEIS

A109405

a(2) = 36; for n >= 3, a(n) = 2^a(n-1) mod 10^n.

36, 736, 8736, 48736, 948736, 2948736, 32948736, 432948736, 3432948736, 53432948736, 353432948736, 5353432948736, 75353432948736, 75353432948736, 5075353432948736, 15075353432948736, 615075353432948736

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OFFSET

2,1

COMMENTS

Decimal digits read backwards form A133612.

Related to but different from A064541 and A121319.

LINKS

Harvey P. Dale, Table of n, a(n) for n = 2..1000

MATHEMATICA

a = 36; For[n = 3, n < 25, n++, a = PowerMod[2, a, 10^n]; Print[a]] (* Stefan Steinerberger, May 25 2007 *)

nxt[{n_, a_}]:={n+1, PowerMod[2, a, 10^(n+1)]}; NestList[nxt, {2, 36}, 20][[All, 2]] (* Harvey P. Dale, Jan 22 2023 *)

CROSSREFS

Same as A113627 except for the initial term (14). - Max Alekseyev, May 11 2007

Sequence in context: A232131 A138832 A223998 * A064541 A058001 A004329

Adjacent sequences: A109402 A109403 A109404 * A109406 A109407 A109408

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, following email from Max Alekseyev, May 06 2007

EXTENSIONS

More terms from Stefan Steinerberger, May 25 2007

STATUS

approved