A075403 Smallest k such that the difference between the k-th triangular number and the following prime is equal to n.

2, 1, 5, 28, 10, 48, 13, 15, 65, 160, 58, 80, 106, 32, 162, 91, 94, 188, 70, 127, 62, 304, 201, 120, 394, 103, 141, 244, 382, 455, 301, 380, 521, 700, 625, 212, 721, 611, 681, 979, 277, 815, 1201, 1275, 569, 4588, 558, 2331, 5113, 1704, 1337, 2551, 2101

Offset: 0

Author

Amarnath Murthy, Sep 23 2002

Keywords

• nonn

Comments

Index of the first occurrence of n in A075402.

Links

• Donovan Johnson, Table of n, a(n) for n = 0..500

Crossrefs

Cf. A075402.

Programs

PARI

for(n=1,100,f=0:for(k=1,50000,if(nextprime(k*(k+1)/2)-k*(k+1)/2==n,f=k:break)):print1(f","))

Extensions

Corrected and extended by Ralf Stephan, Mar 19 2003