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    \$\begingroup\$ Have you tried using the sequence operator ...? It makes sequence stuff like this a lot easier. For example, your my@a=1,2;push @a,operation while condition can be 1,2,{operation}...condition. With a few other golfs, this can be as low as 49 bytes \$\endgroup\$ Commented Mar 21, 2019 at 3:37
  • \$\begingroup\$ Not sure if that'd work here because the next term depends on all of the previous terms. \$\endgroup\$ Commented Mar 21, 2019 at 5:18
  • \$\begingroup\$ 67 (0-indexing is allowed though, so this could be 65) \$\endgroup\$ Commented Mar 21, 2019 at 5:38
  • \$\begingroup\$ Derp, didn't come to my mind that there was .first. \$\endgroup\$ Commented Mar 21, 2019 at 5:39
  • 1
    \$\begingroup\$ O_o well that was a big jump. it'd be nice if you could link to TIO though \$\endgroup\$ Commented Mar 21, 2019 at 5:44