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 A078494 Primes occurring only once in their decade. 23
 97, 113, 127, 149, 181, 211, 241, 293, 307, 367, 397, 419, 421, 457, 479, 487, 557, 587, 631, 661, 683, 691, 719, 727, 743, 773, 787, 797, 809, 811, 839, 863, 877, 907, 929, 937, 953, 967, 983, 1009, 1021, 1049, 1051, 1087, 1117, 1163, 1171, 1193, 1201, 1249 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 FORMULA a(n) ~ n log n. In particular, most primes are in this sequence. - Charles R Greathouse IV, Sep 07 2012 PROG (PARI) decade1pr(n1, n2) = { forstep(x=n1, n2, 10, if(isprime(x+1) && !isprime(x+3) && !isprime(x+7) && !isprime(x+9), print1(x+1" "); ); if(isprime(x+3) && !isprime(x+1) && !isprime(x+7) && !isprime(x+9), print1(x+3" "); ); if(isprime(x+7) && !isprime(x+1) && !isprime(x+3) && !isprime(x+9), print1(x+7" "); ); if(isprime(x+9) && !isprime(x+1) && !isprime(x+3) && !isprime(x+7), print1(x+9" "); ); ); } (MAGMA) &cat [PrimesInInterval(10*n+1, 10*n+9): n in [0..150] | IsOne(#PrimesInInterval(10*n+1, 10*n+9))]; // Bruno Berselli, Sep 05 2012 CROSSREFS Cf. A078500. Sequence in context: A033202 A160032 A136477 * A139980 A140830 A038133 Adjacent sequences:  A078491 A078492 A078493 * A078495 A078496 A078497 KEYWORD nonn,easy,base AUTHOR Cino Hilliard, Jan 04 2003 STATUS approved

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Last modified June 14 01:29 EDT 2021. Contains 345016 sequences. (Running on oeis4.)