Numbers k such that k^2 + k - 1 and k^2 + k + 1 are twin primes and (k + 1)*(k + 1) + k + 1 - 1 and (k + 1)*(k + 1) + k + 1 + 1 are also twin primes.

A088498

Numbers k such that k^2 + k - 1 and k^2 + k + 1 are twin primes and (k + 1)*(k + 1) + k + 1 - 1 and (k + 1)*(k + 1) + k + 1 + 1 are also twin primes.

Terms

    a(0) =2a(1) =5a(2) =20a(3) =455a(4) =1364a(5) =2204a(6) =2450a(7) =2729a(8) =8540a(9) =18485a(10) =32198a(11) =32318a(12) =32780a(13) =45863a(14) =61214a(15) =72554a(16) =72560a(17) =82145a(18) =83258a(19) =86603a(20) =91370a(21) =95198a(22) =125333a(23) =149330a(24) =176888a(25) =182909a(26) =185534a(27) =210845a(28) =225665a(29) =226253

External references