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 A271220 Concatenate sum of digits of previous term and product of digits of previous term, starting with 6. 1
 6, 66, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236, 1236 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Each term is created by calculating the sum of the digits of the previous number, and the product of its digits. The results are concatenated to give the new number. Starting with 6, the second number is 66. The third number is generated as follows: 6+6=12, 6*6=36, which gives 1236. After that, the numbers remain unchanged, because 1+2+3+6=12 and 1x2x3x6=36, so combined 1236 again. LINKS MATHEMATICA NestList[FromDigits[Flatten@ {IntegerDigits@ Total@ #, IntegerDigits@ If[Length@ # == 1, #, Times @@ #]}] &@ IntegerDigits@ # &, 6, 50] (* Michael De Vlieger, Apr 02 2016 *) CROSSREFS Sequence in context: A122020 A262601 A329930 * A259123 A292026 A126459 Adjacent sequences:  A271217 A271218 A271219 * A271221 A271222 A271223 KEYWORD nonn,base AUTHOR Sander Claassen, Apr 02 2016 STATUS approved

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Last modified July 27 09:47 EDT 2021. Contains 346304 sequences. (Running on oeis4.)