login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A125602 Prime centered triangular numbers. 3
19, 31, 109, 199, 409, 571, 631, 829, 1489, 1999, 2341, 2971, 3529, 4621, 4789, 7039, 7669, 8779, 9721, 10459, 10711, 13681, 14851, 16069, 16381, 17659, 20011, 20359, 23251, 25939, 27541, 29191, 29611, 31321, 34429, 36739, 40099, 40591, 42589 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

Or prime terms in A005448, or primes of the form 3n(n-1)/2 + 1.

MATHEMATICA

lst={}; Do[If[PrimeQ[p=3n(n-1)/2+1], (*Print[p]; *)AppendTo[lst, p]], {n, 10^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 21 2008]

CROSSREFS

Cf. A005448, A125603.

Sequence in context: A032743 A106861 A107168 * A139847 A087764 A146691

Adjacent sequences:  A125599 A125600 A125601 * A125603 A125604 A125605

KEYWORD

nonn

AUTHOR

Zak Seidov (zakseidov(AT)gmail.com), Nov 27 2006

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 23 08:31 EST 2012. Contains 206628 sequences.