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 A238332 Primes whose digits, after the first, form a nonprime number not occurring earlier. 2
 11, 19, 127, 139, 149, 151, 157, 163, 181, 191, 193, 199, 233, 269, 277, 421, 487, 1117, 1123, 1129, 1153, 1171, 1187, 1201, 1213, 1217, 1231, 1237, 1249, 1259, 1279, 1289, 1291, 1297, 1301, 1303, 1319, 1321, 1327, 1361, 1381, 1399, 1423, 1427, 1429, 1447 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The corresponding nonprime numbers are in A238333. LINKS T. D. Noe and Reinhard Zumkeller, Table of n, a(n) for n = 1..10000, first 2700 terms from T. D. Noe MATHEMATICA t = {}; eList = {}; p = 7; While[Length[t] < 1000, p = NextPrime[p]; e = FromDigits[Rest[IntegerDigits[p]]]; If[! PrimeQ[e] && ! MemberQ[eList, e], AppendTo[t, p]; AppendTo[eList, e]]]; t PROG (Haskell) a238332 n = a238332_list !! (n-1) a238332_list = f [] \$ drop 4 a000040_list where    f xs (p:ps) | a010051 t == 1 || t `elem` xs = f xs ps                | otherwise = p : f (t:xs) ps                where t = read \$ tail \$ show p -- Reinhard Zumkeller, Feb 28 2014 CROSSREFS Cf. A000040 (prime numbers), A238333. Cf. A010051. Sequence in context: A043968 A199329 A121132 * A089773 A048389 A163151 Adjacent sequences:  A238329 A238330 A238331 * A238333 A238334 A238335 KEYWORD nonn,base AUTHOR T. D. Noe, Feb 28 2014 STATUS approved

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Last modified October 29 04:54 EDT 2020. Contains 338066 sequences. (Running on oeis4.)