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A158473
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Primes whose digit sum contains one or more digits of the same prime.
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4
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2, 3, 5, 7, 19, 109, 127, 137, 139, 149, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 271, 281, 283, 307, 317, 337, 347, 367, 373, 379, 397, 419, 461, 463, 467, 491, 541, 557, 571, 613, 617, 619, 631, 641, 643, 647, 661, 673, 691, 719, 733, 739, 743, 751
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OFFSET
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1,1
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LINKS
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EXAMPLE
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139 is a prime whose digit sum of 13 contains the digits 1 and 3 which are also in the prime.
149 is a prime whose digit sum of 14 contains the digits 1 and 4 which are also in the prime.
419 is a prime whose digit sum of 14 contains the digits 1 and 4 which are also in the prime.
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MAPLE
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filter:= proc(n) local L, s;
L:= convert(n, base, 10);
s:= convert(L, `+`);
convert(convert(s, base, 10), set) intersect convert(L, set) <> {}
end proc:
select(filter, [seq(ithprime(i), i=1..100)]); # Robert Israel, Feb 27 2023
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PROG
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(PARI) isok(p) = isprime(p) && (#setintersect(Set(digits(p)), Set(digits(sumdigits(p)))) >= 1); \\ Michel Marcus, Nov 12 2017
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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