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 A031938 Lower prime of a difference of 20 between consecutive primes. 14
 887, 1637, 3089, 3413, 3947, 5717, 5903, 5987, 6803, 7649, 8243, 8543, 8783, 8867, 9257, 10223, 10433, 10667, 11027, 11093, 11177, 11447, 11597, 11657, 11867, 11987, 13127, 13421, 13649, 14087, 14177, 15473, 16943, 17519, 17807 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Remi Eismann, Table of n, a(n) for n = 1..10000 EXAMPLE 887 is a term as the next prime is 907. MATHEMATICA (*M6*) a=887; S={}; Do[b=NextPrime[a]; If[b-a==20, AppendTo[S, a]]; a=b, {10^4}]; S [Zak Seidov, Aug 14 2009] Transpose[Select[Partition[Prime[Range[2000]], 2, 1], Last[#] - First[#] == 20 &]][[1]] (* Bruno Berselli, Apr 09 2013 *) PROG (MAGMA) [p: p in PrimesUpTo(20000) | NextPrime(p)-p eq 20]; // Bruno Berselli, Apr 09 2013 CROSSREFS Sequence in context: A103811 A190354 A164513 * A165504 A136966 A232152 Adjacent sequences:  A031935 A031936 A031937 * A031939 A031940 A031941 KEYWORD nonn AUTHOR EXTENSIONS Entries and b-file checked by Zak Seidov, Aug 14 2009 STATUS approved

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Last modified October 17 16:51 EDT 2019. Contains 328120 sequences. (Running on oeis4.)