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added 36 characters in body

edited Mar 13, 2020 at 16:14

R, 2727 25 bytes

-1 byte thanks to Giuseppe

2-sum1+all(!sqrt(scan()+1:2)%%1^.5%%1)

Uses the fact that \$s_n=1\$ iff \$n+1\$ or \$n+2\$ is a perfect square.

2-sum(!sqrt(scan()+1:2)%%1)

Uses the fact that \$s_n=1\$ iff \$n+1\$ or \$n+2\$ is a perfect square.

-1 byte thanks to Giuseppe

1+all((scan()+1:2)^.5%%1)

Uses the fact that \$s_n=1\$ iff \$n+1\$ or \$n+2\$ is a perfect square.

answered Mar 13, 2020 at 15:54

2-sum(!sqrt(scan()+1:2)%%1)

Uses the fact that \$s_n=1\$ iff \$n+1\$ or \$n+2\$ is a perfect square.