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+# project euler 37
+# many of the same primality checks, so memo
+# n ? is_prime(n)
+p ← memo(=1⧻°/×)
+
+# by picking sufficiently large n (n > ~800000),
+# all such primes will be found.
+n ← 800000
+▽⊸≡p+8⇡n # find primes below n, skipping first 7
+▽⊸≡(
+  # keep those that satisfy
+  ⊃⍜⇌⧅(⋕⇌)⧅⋕ °⋕ # (1) prefixes; and (2) suffixes
+  ↧∩(/↧≡p)      # are all prime
+)
+/+ # sum primes
+
+# online pad
+# https://www.uiua.org/pad?src=0_17_0-dev_2__IyBwcm9qZWN0IGV1bGVyIDM3CiMgbWFueSBvZiB0aGUgc2FtZSBwcmltYWxpdHkgY2hlY2tzLCBzbyBtZW1vCiMgbiA_IGlzX3ByaW1lKG4pCnAg4oaQIG1lbW8oPTHip7vCsC_DlykKCm4g4oaQIDEwMDAK4pa94oq44omhcCs44oehbiAjIGZpbmQgcHJpbWVzIGJlbG93IG4sIHNraXBwaW5nIGZpcnN0IDcK4pa94oq44omhKAogICMga2VlcCB0aG9zZSB0aGF0IHNhdGlzZnkKICDiioPijZzih4zip4Uo4ouV4oeMKeKnheKLlSDCsOKLlSAjICgxKSBwcmVmaXhlczsgYW5kICgyKSBzdWZmaXhlcwogIOKGp-KIqSgv4oan4omhcCkgICAgICAjIGFyZSBhbGwgcHJpbWUKKQovK-KfnOKnuyAjIHN1bSBhbmQgY291bnQK