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

1,1

Comments

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

Links

Table of n, a(n) for n=1..34.

Prog

(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

Crossrefs

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

Sequence in context: A166283 A350676 A186721 * A147448 A146449 A145956

Adjacent sequences: A177942 A177943 A177944 * A177946 A177947 A177948

Keyword

nonn

Author

Vladimir Shevelev, May 15 2010

Extensions

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

More terms from Michel Marcus, Dec 14 2018

Status

approved