a(n) is the sum of all integers of the form k^2 + 1 whose greatest prime factor is A002313(n), the n-th prime not congruent to 3 mod 4.
A379347
a(n) is the sum of all integers of the form k^2 + 1 whose greatest prime factor is A002313(n), the n-th prime not congruent to 3 mod 4.
Terms
- a(0) =1a(1) =12a(2) =327a(3) =391a(4) =703a(5) =20510a(6) =5667a(7) =661016a(8) =507004a(9) =644098a(10) =24977604a(11) =38394505a(12) =2621510449a(13) =465558141a(14) =624692559a(15) =63435958a(16) =507041846a(17) =8133206945a(19) =45102364892a(20) =49035127231a(21) =154823547391
External references
- oeis: A379347