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COMMENTS
| Prime p divides a(p-1). n divides a(n-1) for all prime n and all odd composite n. p divides a((p+1)/2) for prime p = {3,5,11,13,19,29,37,43,53,59,61,67,83,...} = A003629(n) = Primes congruent to {3,5} mod 8. p divides a((p+3)/4) for prime p = {13,73,97,109,181,229,241,277,337,409,421,457,541,709,733,757,829,...} = A107141(n) Primes of the form 4x^2+9y^2. p divides a((p+5)/6) for prime p = {43,61,79,109,151,163,181,193,313,337,433,523,577,631,643,673,787,829,907,991,...}. p divides a((p+7)/8) for prime p = {113,137,569,641,673,1129,1289,1297,1481,1801,...}. p divides a((3p-1)/2) for prime p = {5,7,13,23,29,31,37,47,53,61,71,79,101,103,109,127,149,151,157,167,173,181,191, 197,199,...} = A003628(n) Primes congruent to {5, 7} mod 8. p^2 divides a((3p-1)/2) for prime p = {5,13,173,5501,...} = A124924(n)..
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