A325439 Indices of primes of the form k^2 + 1 ending in 7.
3, 4, 6, 7, 9, 10, 11, 13, 14, 15, 16, 17, 19, 21, 23, 24, 26, 27, 29, 32, 34, 35, 36, 38, 40, 43, 45, 48, 50, 51, 52, 55, 56, 57, 59, 62, 64, 65, 66, 68, 70, 71, 72, 73, 75, 76, 77, 78, 79, 80, 81, 82, 83, 85, 87, 89, 90, 91, 95, 97, 98, 99, 101, 103, 107
Offset: 1
Links
- Robert Israel, Table of n, a(n) for n = 1..10000
Programs
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Maple
P:=[seq(k mod 10,k=select(isprime,[2,seq(4*i^2+1,i=1..10000)]))]: seq(`if`(P[i] mod 10 = 7,i,NULL),i=1..nops(P));
Formula
A002496(a(n)) mod 10 = 7.
Comments