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For n > 0, a(n+1) is the least prime not already used such that abs(a(n+1)-a(n))/2n is prime.
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_Amarnath Murthy (amarnath_murthy(AT)yahoo.com), _, Apr 25 2004
The last term is a(110) = 5. The smallest primes that don't occur are 2, 11, 23 and 113. - _David Wasserman (dwasserm(AT)earthlink.net), _, Mar 07 2007
More terms from _David Wasserman (dwasserm(AT)earthlink.net), _, Mar 07 2007
The last term is a(110) = 5. The smallest primes that don't occur are 2, 11, 23, and 113. - David Wasserman (dwasserm(AT)earthlink.net), Mar 07 2007
nonn,fini,full,less,new
Rearrangement of odd primes such that absolute[For n > 0, a(n+1) - a(n)] is 2n times a the least prime. Or { not already used such that abs(a(n+1)-a(n)}/2n is a prime.
3, 7, 19, 31, 47, 17, 41, 13, 61, 97, 37, 103, 151, 73, 157, 67, 131, 29, 101, 367, 167, 83, 919, 137, 233, 383, 227, 389, 109, 283, 163, 349, 541, 79, 419, 769, 409, 557, 709, 1567, 1327, 1163, 71, 673, 937, 307, 491, 773, 293, 587, 787, 277, 797, 479, 263, 43, 379, 607, 839, 1193, 353, 719, 347, 599, 983, 593, 197, 13999, 2711, 89, 509, 8887, 3559, 3121, 1493, 443, 139, 601, 1069, 1543, 743, 257, 2389, 563, 59, 569, 53, 401, 929, 2887, 547, 911, 359, 1289, 3733, 503, 887, 499, 107, 701, 1301, 1907, 1499, 881, 1297, 877, 241, 883, 1531, 5
The last term is a(110) = 5. The smallest primes that don't occur are 2, 11, 23, and 113. - David Wasserman (dwasserm(AT)earthlink.net), Mar 07 2007
a(5) = 47 hence a(6) = 17, which has not occurred earlier, as (47-17)/(2*5) = 3 is a prime.
as (47-17)/(2*5) = 3 is a prime.
Cf. A093931.
more,nonn,uned,newfini,full,less
More terms from David Wasserman (dwasserm(AT)earthlink.net), Mar 07 2007
more,nonn,uned,new
Warning: Many recent communications from this author have contained numerical errors or have been badly formatted. This entry has not been edited and may contain errors. It is included on a provisional basis in the hope that some reader will edit it. - njas
Rearrangement of odd primes such that absolute[a(n+1) - a(n)] is 2n times a prime. Or {a(n+1)-a(n)}/2n is a prime.
3, 7, 19, 31, 47, 17, 41, 13, 61, 97, 37
1,1
a(5) = 47 hence a(6) = 17, which has not occurred earlier,
as (47-17)/(2*5) = 3 is a prime.
more,nonn,uned
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 25 2004
Warning: Many recent communications from this author have contained numerical errors or have been badly formatted. This entry has not been edited and may contain errors. It is included on a provisional basis in the hope that some reader will edit it. - njas
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