A085931 Leading diagonal of A085930.

2, 4, 12, 17, 23, 39, 48, 58, 69, 95, 109, 124, 140, 157, 195, 215, 236, 258, 281, 305, 357, 384, 412, 441, 471, 502, 534, 602, 637, 673, 710, 748, 787, 827, 868, 954, 998, 1043, 1089, 1136, 1184, 1233, 1283, 1334, 1440, 1494, 1549, 1605, 1662, 1720, 1779

Offset

1,1

Links

Gheorghe Coserea, Table of n, a(n) for n = 1..10000

T. Forbes, Prime k-tuplets

Prog

(PARI)
a(n) = my(x = (sqrtint(1+8*n)-1)\2); (x+n)*(x+n+1)/2 - n;
vector(51, n, a(n))  \\ Gheorghe Coserea, Mar 25 2016

Crossrefs

Cf. A085930.

Sequence in context: A233191 A192533 A371278 * A125885 A067929 A349080

Adjacent sequences: A085928 A085929 A085930 * A085932 A085933 A085934

Keyword

easy,nonn

Author

Jason Earls and Amarnath Murthy, Jul 14 2003

Extensions

Offset corrected by Gheorghe Coserea, Mar 25 2016

Status

approved