cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A247980 Least prime whose square contributes to A234429.

Original entry on oeis.org

2, 3, 5, 7, 13, 17, 19, 43, 67, 83, 163, 167, 313, 433, 883, 887, 1667, 5167, 5477, 6833, 8167, 17317, 22133, 59833, 70583, 89417, 141067, 160583, 191833, 298327, 882433, 1728583, 2447437, 3143087, 3143167, 4468333, 12957083, 13747687, 26457133
Offset: 1

Views

Author

Robert G. Wilson v, Sep 28 2014

Keywords

Comments

Listed lexicographically and not in the order defined by A234429. See examples.

Examples

			2^2 = 4 = A234429(1),
3^2 = 9 = A234429(3),
5^2 = 25 -> 7 = A234429(2),
7^2 = 49 -> 13 = A234429(5),
19^2 = 361 -> 10 = A234429(4), etc.
		

Crossrefs

Cf. A234429.

Programs

  • Mathematica
    p = 2; lst = lsu = {}; While[p < 15250000001, ds = Total@ IntegerDigits[p^2]; If[ !MemberQ[lst, ds], AppendTo[lst, ds]; AppendTo[lsu, p]; Print[ p]]; p = NextPrime@ p]; lsu
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