A219997 Decades whose prime pattern is same as the prime pattern in the previous decade, with at least one prime.
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
Links
- V. Raman, Table of n, a(n) for n = 1..10000
Programs
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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.