A226803 Primes p where the digital sum of p^2 is equal to 7.

5, 149, 1049

Offset

1,1

Comments

No more terms below 10^9. - Michel Marcus, Nov 02 2013

No more terms below 10^20. - Hiroaki Yamanouchi, Sep 23 2014

Sequence is complete, because A215614 is complete. - Robert Israel, Sep 23 2014

Links

Table of n, a(n) for n=1..3.

Example

5 is in the sequence because 5^2 = 25 and 2 + 5 = 7.
149 is in the sequence because 149^2 = 22201 and 2 + 2 + 2 + 0 + 1 = 7.

Mathematica

Select[Prime[Range[10000]], Total[IntegerDigits[#^2]] == 7 &]

Prog

(Magma) [p: p in PrimesUpTo(6*10^6) | &+Intseq(p^2) eq 7];
(PARI) lista(nn) = {forprime(p=2, nn, if (sumdigits(p^2)==7, print1(p, ", ")); ); } \\ Michel Marcus, Nov 02 2013

Crossrefs

Cf. A226802, A165492, A165459, A165493, A215614.

Sequence in context: A346084 A075186 A352758 * A362494 A332716 A230666

Adjacent sequences: A226800 A226801 A226802 * A226804 A226805 A226806

Keyword

nonn,base,bref,fini,full

Author

Vincenzo Librandi, Jun 24 2013

Status

approved