A129540 Triangular numbers T such that T+10 is the next prime after T.

1711, 1891, 4851, 9591, 18721, 23653, 24753, 27261, 32131, 35511, 57291, 64261, 69751, 77421, 79401, 81003, 102831, 106491, 108811, 114003, 115921, 147153, 153181, 155403, 171991, 178503, 181503, 191271, 200661, 208981, 219453

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Maple

a := proc (n) if nextprime((1/2)*n*(n+1)) = 10+(1/2)*n*(n+1) then (1/2)*n*(n+1) else end if end proc: seq(a(n), n = 1 .. 700); # Emeric Deutsch, Jun 20 2007

Crossrefs

Cf. A000217, A129755.

Sequence in context: A062916 A241554 A352949 * A293480 A227218 A280113

Adjacent sequences: A129537 A129538 A129539 * A129541 A129542 A129543

Keyword

nonn

Author

Zak Seidov, May 29 2007

Extensions

More terms from Emeric Deutsch, Jun 20 2007

Status

approved