14917...53217 (42-digits)
This number is a prime.
14 9172716659 7036592132 9742264032 9712953217
The start of a sequence of 22 type 4k+1 primes such that every next term is equal to a*b+1, where a and b are the square decomposition of the previous prime, i.e., p(i-1) = a^2+b^2, pi = a*b+1: 149172716659703659213297422640329712953217 ->
12099688650324688968668103045607614193 ->
11487118307550560664784913589052510969 ->
42876888150434052973459919973016921 ->
33705905571268669976792858692557481 ->
7031965605758664339776091952244521 ->
248295920404475618157548087881 ->
1623255678955050222529829281 -> 3853435225785707882041
-> 10815509128000081 -> 324264641521 ->
314582278321 -> 25902808801 -> 806229241 ->
549556801 -> 16454881 -> 15569401 -> 12743641
-> 6978841 -> 2317561 -> 1921921 -> 903841
-> 196561 -> 129481 -> 0. [Rivera]