Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=1..56.
34 is in the sequence because 34 + 33^2 = 1123 and 34 + 35^2 = 1259 are both prime.
L:=; for k from 1 to 1000 do if isprime(k+(k-1)^2) and isprime(k+(k+1)^2) then L:=[op(L), k] fi od;
Sequence in context: A094093 A240077 A237997 * A027947 A067236 A250255
Adjacent sequences: A108806 A108807 A108808 * A108810 A108811 A108812
Walter Kehowski, Jul 04 2005