A177943 Locations of records in A177942.

1, 3, 4, 9, 11, 13, 20, 33, 42, 49, 84, 86, 107, 109, 123, 128, 191, 295, 296, 318, 330, 337, 396, 453, 481, 616, 663, 771, 882, 1105, 1180, 1257, 1431, 1659, 1856, 1936, 2130, 2370, 2584, 2651, 2790, 2959, 3009, 3080, 3121, 3189, 3503, 3639, 3879, 3902, 3961

Offset: 1

Author

Vladimir Shevelev, May 15 2010

Keywords

• nonn

Comments

Also: indices m for which A177941(m)-2 and A177941(m)+2 are cousin primes (A023200).

Crossrefs

Cf. A177941, A177942, A023200, A177929, A177930, A177931, A177945

Programs

PARI

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

Extensions

1 inserted, a(10) corrected and sequence extended by R. J. Mathar, Jun 30 2010

More terms from Michel Marcus, Dec 14 2018