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1,1
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;
Cf. A027861.
Sequence in context: A094093 A240077 A237997 * A027947 A067236 A250255
Adjacent sequences: A108806 A108807 A108808 * A108810 A108811 A108812
easy,nonn
Walter Kehowski, Jul 04 2005
approved