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edited Jun 17, 2020 at 9:04

#SWI-Prolog, 51 bytes

SWI-Prolog, 51 bytes

a(X):-X>1,\+ (Y is X-1,between(2,Y,I),0=:=X mod I).

This uses predicate between/3 which is not an ISO-Prolog predicate.

#SWI-Prolog, 51 bytes

a(X):-X>1,\+ (Y is X-1,between(2,Y,I),0=:=X mod I).

This uses predicate between/3 which is not an ISO-Prolog predicate.

a(X):-X>1,\+ (Y is X-1,between(2,Y,I),0=:=X mod I).

This uses predicate between/3 which is not an ISO-Prolog predicate.

answered Sep 17, 2015 at 8:15

#SWI-Prolog, 51 bytes

a(X):-X>1,\+ (Y is X-1,between(2,Y,I),0=:=X mod I).

This uses predicate between/3 which is not an ISO-Prolog predicate.