cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A219997 Decades whose prime pattern is same as the prime pattern in the previous decade, with at least one prime.

Original entry on oeis.org

38, 79, 125, 140, 155, 181, 235, 277, 289, 292, 311, 332, 437, 445, 500, 533, 559, 610, 617, 625, 649, 697, 707, 718, 751, 821, 857, 874, 895, 952, 962, 974, 1048, 1073, 1100, 1115, 1189, 1271, 1310, 1348, 1352, 1357, 1367, 1384, 1415, 1420, 1430, 1448, 1474
Offset: 1

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Author

V. Raman, Dec 07 2012

Keywords

Crossrefs

Cf. A190639.
Cf. A216329 (lower decade).

Programs

  • PARI
    for(i=2, 1500, if(isprime(10*i-9)==isprime(10*i+1)&&isprime(10*i-7)==isprime(10*i+3)&&isprime(10*i-3)==isprime(10*i+7)&&isprime(10*i-1)==isprime(10*i+9)&&isprime(10*i+1)+isprime(10*i+3)+isprime(10*i+7)+isprime(10*i+9)>=1, print1(i", ")))

Formula

a(n) >> n log^2 n.
a(n) = A216329(n) + 1.
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