A140718 Let S be the 28 primes generated by the polynomial 2*x^2+29, for 1<=x<=28. This finite sequence is S interleaved with the reverse of S and with each term repeated 4 times.

31, 31, 31, 31, 1597, 1597, 1597, 1597, 37, 37, 37, 37, 1487, 1487, 1487, 1487, 47, 47, 47, 47, 1381, 1381, 1381, 1381, 61, 61, 61, 61, 1279, 1279, 1279, 1279, 79, 79, 79, 79, 1181, 1181, 1181, 1181, 101, 101, 101, 101, 1087, 1087, 1087, 1087, 127, 127, 127

Offset

1,1

Comments

The polynomial 2*x^2+29 is prime for 1<=x<=28.

Links

Sean A. Irvine, Table of n, a(n) for n = 1..224

Formula

a(8*n-7) = a(8*n-6) = a(8*n-5) = a(8*n-4) = 2*n^2+29, 1 <= n <= 28.

a(8*n-3) = a(8*n-2) = a(8*n-1) = a(8*n) = 2*(29-n)^2+29, 1 <= n <= 28.

Crossrefs

Cf. A140708.

Sequence in context: A010870 A003892 A085320 * A040931 A022365 A070921

Adjacent sequences: A140715 A140716 A140717 * A140719 A140720 A140721

Keyword

nonn,dumb,less,fini,full

Author

Aldrich Stevens (aldrichstevens(AT)msn.com), Jul 11 2008

Extensions

Revised by Sean A. Irvine, Jan 31 2026

Status

approved