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 A247052 Primes composed of only digits with line segments or both line segments and curves {1, 2, 4, 5, 7}. 2
 2, 5, 7, 11, 17, 41, 47, 71, 127, 151, 157, 211, 227, 241, 251, 257, 271, 277, 421, 457, 521, 541, 547, 557, 571, 577, 727, 751, 757, 1117, 1151, 1171, 1217, 1277, 1427, 1447, 1451, 1471, 1511, 1571, 1721, 1741, 1747, 1777, 2111, 2141, 2221, 2251, 2411, 2417 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Intersection of A000040 and A082741. LINKS K. D. Bajpai, Table of n, a(n) for n = 1..15000 EXAMPLE 127 is in the sequence because it is prime and composed of digits 1, 2 and 7 only. 1427 is in the sequence because it is prime and composed of digits 1, 2, 4 and 7 only. a(129) = 12457 is the smallest prime using all the digits 1, 2, 4, 5 and 7 only once. MATHEMATICA Select[Prime[Range[500]], Intersection[IntegerDigits[#], {0, 3, 6, 8, 9}] == {} &] PROG (Python) for n in range(1, 10**3): ..s = str(prime(n)) ..if not (s.count('0') + s.count('3') + s.count('6') + s.count('8') + s.count('9')): ....print(int(s), end=', ') # Derek Orr, Sep 18 2014 (Magma) [NthPrime(n): n in [1..400] | Set(Intseq(NthPrime(n))) subset [1, 2, 4, 5, 7] ]; // Vincenzo Librandi, Sep 19 2014 CROSSREFS Cf. A000040, A082741. Sequence in context: A045349 A338339 A224320 * A364649 A163695 A134641 Adjacent sequences: A247049 A247050 A247051 * A247053 A247054 A247055 KEYWORD nonn,base,less AUTHOR K. D. Bajpai, Sep 10 2014 STATUS approved

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Last modified April 21 23:36 EDT 2024. Contains 371886 sequences. (Running on oeis4.)