freeCodeCamp

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id	challengeType	title	forumTopicId
5900f5411000cf542c510052	5	Problem 467: Superinteger	302142

Description

An integer s is called a superinteger of another integer n if the digits of n form a subsequence of the digits of s. For example, 2718281828 is a superinteger of 18828, while 314159 is not a superinteger of 151.

Let p(n) be the nth prime number, and let c(n) be the nth composite number. For example, p(1) = 2, p(10) = 29, c(1) = 4 and c(10) = 18. {p(i) : i ≥ 1} = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, ...} {c(i) : i ≥ 1} = {4, 6, 8, 9, 10, 12, 14, 15, 16, 18, ...}

Let PD the sequence of the digital roots of {p(i)} (CD is defined similarly for {c(i)}): PD = {2, 3, 5, 7, 2, 4, 8, 1, 5, 2, ...} CD = {4, 6, 8, 9, 1, 3, 5, 6, 7, 9, ...}

Let Pn be the integer formed by concatenating the first n elements of PD (Cn is defined similarly for CD). P10 = 2357248152 C10 = 4689135679

Let f(n) be the smallest positive integer that is a common superinteger of Pn and Cn. For example, f(10) = 2357246891352679, and f(100) mod 1 000 000 007 = 771661825.

Find f(10 000) mod 1 000 000 007.

Instructions

Tests

tests:
  - text: <code>euler467()</code> should return 775181359.
    testString: assert.strictEqual(euler467(), 775181359);

Challenge Seed

function euler467() {
  // Good luck!
  return true;
}

euler467();

Solution

// solution required

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