A174046 Places n for which A001359(n) and A023200(n) is a twin prime pair.
2, 3, 4, 6, 14, 16, 29, 356, 358, 359, 403, 446, 464, 485, 652, 655, 764, 861, 866, 1123, 1301, 1304, 1324, 1328, 1358, 1486, 1610, 2631, 2632, 3735, 3931, 3953, 3956, 3957, 4679, 4855, 4931, 5222, 5226, 5269, 5283, 5292, 5403, 5427, 5445
Offset: 1
Keywords
Examples
2 is in the sequence because A001359(2)=5 and A023200(2)=7 are twin primes.
Links
- Michel Marcus, Table of n, a(n) for n = 1..149
Programs
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PARI
lista(nn) = {vp = primes(nn); va = select(x->isprime(x+2), vp); vb = select(x->isprime(x+4), vp); for (n=1, min(#va, #vb), if (vb[n] == va[n]+2, print1(n, ", ")););} \\ Michel Marcus, Jul 22 2017
Extensions
Terms beyond 29 from R. J. Mathar, Nov 03 2011
Edited by Michel Marcus, Jul 22 2017