%I #48 Mar 02 2024 14:06:46
%S 1,3,7,8,21,49,76,224,467,514,1155,2683,5216,10544,26867,51510,95823,
%T 198669,357535,863317,1811764,3007503,5598802,14428676,33185509,
%U 54538862,111949941,227634408,400708894,1033162084,2102388551,3093472814,7137437912
%N The private keys for the 32 BTC Bitcoin puzzle.
%C This is a well-known sequence in the Bitcoin community.
%C In 2015, an anonymous Bitcoin user created a challenge or puzzle comprising 256 private keys of increasing size and transferred bitcoin amounts .001 through .256 to them.
%C The keys are apparently arbitrary values, apart from being in the range 2^(n-1) <= a(n) < 2^n, and the first person to find a key can take the bitcoin amount at that key.
%H Darío Clavijo, <a href="/A369920/b369920.txt">Table of n, a(n) for n = 1..65</a>.
%H Bitcointalk forum, <a href="https://bitcointalk.org/index.php?topic=1306983.0">Bitcoin puzzle transaction ~32 BTC prize to who solves it</a>.
%H Blockchain.com, <a href="https://www.blockchain.com/explorer/transactions/btc/08389f34c98c606322740c0be6a7125d9860bb8d5cb182c02f98461e5fa6cd15">The original Bitcoin transaction</a>.
%H privatekeys.pw, <a href="https://privatekeys.pw/puzzles/bitcoin-puzzle-tx">~1000 BTC Bitcoin Challenge Transaction</a>.
%F 2^(n-1) <= a(n) < 2^(n).
%K nonn,hard,fini,less
%O 1,2
%A _Darío Clavijo_, Feb 05 2024