This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A070282 a(1) = 1; a(2) = 2; a(n) = [sum of digits of a(n-1)]^[sum of digits of a(n-2)] for n > 2. 1
 1, 2, 2, 4, 16, 2401, 823543, 6103515625, 193630125104980427932766033374162714624, 121679161406852748316898260838871037524995421354288562472420444438058627601 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS The next term, a(11), has 381 digits. - Harvey P. Dale, Jan 08 2013 LINKS MATHEMATICA a[n_] := (Plus @@ IntegerDigits[a[n - 1]])^(Plus @@ IntegerDigits[a[n - 2]]); a[1] = 1; a[2] = 2; Table[ a[n], {n, 1, 10}] nxt[{a_, b_}]:={b, Total[IntegerDigits[b]]^Total[IntegerDigits[a]]}; Transpose[ NestList[nxt, {1, 2}, 10]][[1]] (* Harvey P. Dale, Jan 08 2013 *) CROSSREFS Sequence in context: A171163 A129614 A070283 * A267218 A051285 A079556 Adjacent sequences:  A070279 A070280 A070281 * A070283 A070284 A070285 KEYWORD base,nonn AUTHOR Joseph L. Pe, May 09 2002 EXTENSIONS Edited by Robert G. Wilson v, May 14 2002 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 8 12:07 EST 2019. Contains 329862 sequences. (Running on oeis4.)