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 A030622 Powers of 2 grouped in pairs of two digits (version 1). 3
 24, 81, 63, 26, 41, 28, 25, 65, 12, 10, 24, 20, 48, 40, 96, 81, 92, 16, 38, 43, 27, 68, 65, 53, 61, 31, 7, 22, 62, 14, 45, 24, 28, 81, 4, 85, 76, 20, 97, 15, 24, 19, 43, 4, 83, 88, 60, 81, 67, 77, 21, 63, 35, 54, 43, 26, 71, 8, 86, 41, 34, 21, 77, 28, 26, 84, 35, 45, 65 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS When a 0 occurs as the most significant digit of the pair, it is simply ignored, e.g., "07" becomes just 7. The following pairs are unaffected. - Alonso del Arte, Mar 28 2020 LINKS EXAMPLE The first few powers of 2 corresponding to positive exponents are 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048. The digits are 2, 4, 8, 1, 6, 3, 2, 6, 4, 1, 2, 8, 2, 5, 6, 5, 1, 2, 1,0, 2, 4, 2, 0, 4, 8. Grouping them in pairs, we obtain 24, 81, 63, 26, 41, 28, 25, 65, 12, 10, 24, 20, 48. MATHEMATICA FromDigits/@Partition[Flatten[IntegerDigits[2^Range[32]]], 2] (* Alonso del Arte, Mar 28 2020 *) PROG (Scala) (List.fill(32)(2: BigInt)).scanLeft(1: BigInt)(_ * _).filter(_ > 1).map(_.toString.toCharArray).flatten.sliding(2, 2).map(_.toArray).toList.map(new String(_)).map(Integer.parseInt(_)) // Alonso del Arte, Mar 28 2020 CROSSREFS Cf. A030623, A030624, A000079, A000455. Sequence in context: A211597 A318988 A182915 * A063456 A265646 A304158 Adjacent sequences: A030619 A030620 A030621 * A030623 A030624 A030625 KEYWORD nonn,base,easy AUTHOR Alexei Kozlowski (bros(AT)spf.minsk.by) EXTENSIONS More terms from Douglas Winston (douglas.winston(AT)srupc.com), Nov 06 2003 STATUS approved

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Last modified December 7 12:36 EST 2022. Contains 358656 sequences. (Running on oeis4.)