A237267 The positions of records in A236747.

1, 2, 5, 105, 585, 1041, 1590, 3582, 5460, 19425, 21450, 21540, 33495, 42315, 101745, 122265, 151710, 176190, 252525, 267435, 318780, 343800, 464100, 542640, 868140, 996765, 1080450, 1217370, 1322685, 1461495, 1477875, 1601985, 2523675, 2792790, 3512145

Offset: 1

Author

Antti Karttunen and Juri-Stepan Gerasimov, Feb 05 2014

Keywords

• nonn

Comments

Smallest k such that A236747(k) = n: 1, 2, 5, 105, 585, 1041, 1590, 3582, 6870, 5460,...

Smallest prime p such that A236747(p) = n: 2, 5, 593, 1889, 4457,...

Crossrefs

Cf. A236747 (number of 0 <= k <= sqrt(n) such that n-k and n+k are both prime).

Extensions

a(7)-a(9) from Michel Marcus, Feb 05 2014.

a(9)-a(35) from Giovanni Resta, Feb 09 2014