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A070248 Palindromic primes with digit sum 7. 5
7, 151, 313, 10501, 11311, 30103, 1201021, 3001003, 100050001, 100131001, 101030101, 110111011, 111010111, 10000500001, 1100011100011, 1100101010011, 100020010020001 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..1111

MATHEMATICA

Do[p = Join[ IntegerDigits[n], Reverse[ Drop[ IntegerDigits[n], -1]]]; q = Plus @@ p; If[ PrimeQ[ FromDigits[p]] && q == 7, Print[ FromDigits[p]]], {n, 1, 10^7}]

CROSSREFS

Cf. A002385, A070247 & A070249.

Sequence in context: A305467 A229806 A229880 * A329010 A309855 A339582

Adjacent sequences:  A070245 A070246 A070247 * A070249 A070250 A070251

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy, May 05 2002

EXTENSIONS

Edited by Robert G. Wilson v, May 15 2002

STATUS

approved

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Last modified September 19 19:41 EDT 2021. Contains 347564 sequences. (Running on oeis4.)