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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A278139 Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers. 1
2, 3, 13, 41, 107, 227, 503, 881, 1409, 2039, 2819, 3947, 5273, 6869, 8699, 11549, 15377, 19937, 24593, 30809, 38069, 47939, 58379, 69257, 82787, 98897, 115733, 133499, 152027, 172127, 192833, 218711, 247391, 279269, 315047, 355517, 399473, 444623 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..38.

MATHEMATICA

lst={1}; p[1]=2; p[n_]:=p[n]=Module[{i=Last[lst]+1},

While[!PrimeQ[p[n-1]+i*(i-1)/2], i++]; AppendTo[lst, i]; p[n-1]+i*(i-1)/2];

p/@Range[50]

CROSSREFS

Cf. A088173, A275030.

Sequence in context: A264042 A122719 A106866 * A280005 A235626 A164133

Adjacent sequences:  A278136 A278137 A278138 * A278140 A278141 A278142

KEYWORD

easy,nonn

AUTHOR

Ivan N. Ianakiev, Nov 13 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)