A177945 Record values in A177942.

3, 7, 13, 37, 79, 163, 349, 757, 1567, 3163, 6547, 13099, 26497, 52999, 106273, 212557, 426889, 855427, 1710853, 3421903, 6845869, 13691767, 27385087, 54771007, 109542907, 219096259, 438203677, 876417229, 1752875893, 3505814527, 7011656629, 14023322167, 28046754727, 56093637367

Offset: 1

Author

Vladimir Shevelev, May 15 2010

Keywords

• nonn

Comments

From the construction of A177941, this is a subsequence of A023200.

Crossrefs

Cf. A177941, A177942, A177943, A023200, A177929, A177930, A177931, A177932.

Programs

PARI

listar(nn) = {my(va = vector(nn), rec = 0); va[1] = 5; for (n=2, nn, p = factor(va[n-1]^2-4)[1,1]; if (p > rec, print1(p, ", "); rec = p); va[n] = va[n-1] + p - 1;);} \\ Michel Marcus, Dec 14 2018

Extensions

Sequence extended by R. J. Mathar, Jun 30 2010

More terms from Michel Marcus, Dec 14 2018